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Articoli di riviste sul tema "Techniques: photometric"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 9 giugno 2025

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1

Tinbergen, Jaap. "New Techniques." International Astronomical Union Colloquium 136 (1993): 130–46. http://dx.doi.org/10.1017/s025292110000748x.

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AbstractRoutine millimagnitude photometry may require a new approach to reduction of photometric errors. Such an approach is outlined in this paper; it stresses elimination of each error as close to its source as possible. The possibilities provided by modern technology are reviewed in this light. An engineering design group dedicated to photometry is a prerequisite and an on-site photometric technician may be necessary. In this concept, observers are mainly remote users of a database. Implied is the idea of accurate photometry necessarily developing into a single but multi-site astronomical f

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Walker, Alistair, Saul Adelman, Eugene Milone, Barbara Anthony-Twarog, Pierre Bastien, Wen Ping Chen, Steve Howell, et al. "DIVISION B COMMISSION 25: ASTRONOMICAL PHOTOMETRY AND POLARIMETRY." Proceedings of the International Astronomical Union 11, T29A (August 2015): 159–70. http://dx.doi.org/10.1017/s1743921316000727.

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Commission 25 (C25) deals with the techniques and issues involved with the measurement of optical and infrared radiation intensities and polarization from astronomical sources. As such, in recent years attention has focused on photometric standard stars, atmospheric extinction, photometric passbands, transformation between systems, nomenclature, and observing and reduction techniques. At the start of the trimester C25 changed its name from Stellar Photometry and Polarization to Astronomical Photometry and Polarization so as to explicitly include in its mandate particular issues arising from th

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Davies, L. J. M., J. E. Thorne, A. S. G. Robotham, S. Bellstedt, S. P. Driver, N. J. Adams, M. Bilicki, et al. "Deep Extragalactic VIsible Legacy Survey (DEVILS): consistent multiwavelength photometry for the DEVILS regions (COSMOS, XMMLSS, and ECDFS)." Monthly Notices of the Royal Astronomical Society 506, no. 1 (June 5, 2021): 256–87. http://dx.doi.org/10.1093/mnras/stab1601.

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ABSTRACT The Deep Extragalactic VIsible Legacy Survey (DEVILS) is an ongoing high-completeness, deep spectroscopic survey of ∼60 000 galaxies to Y &lt; 21.2 mag, over ∼6 deg2 in three well-studied deep extragalactic fields: D10 (COSMOS), D02 (XMMLSS), and D03 (ECDFS). Numerous DEVILS projects all require consistent, uniformly derived and state-of-the-art photometric data with which to measure galaxy properties. Existing photometric catalogues in these regions either use varied photometric measurement techniques for different facilities/wavelengths leading to inconsistencies, older imaging

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4

Goodeve, Joshua L. "Light Streak Photometry and Streaktools." Astronomical Journal 169, no. 3 (February 18, 2025): 151. https://doi.org/10.3847/1538-3881/ada950.

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Abstract The accuracy of photometric calibration has gradually become a limiting factor in various fields of astronomy, limiting the scientific output of a host of research. Calibration using artificial light sources in low Earth orbit remains largely unexplored. Here, we demonstrate that photometric calibration using light sources in low Earth orbit is a viable and competitive alternative/complement to current calibration techniques, and explore the associated ideas and basic theory. We present the publicly available Python code Streaktools as a means to simulate and perform photometric calib

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Cabayol-Garcia, L., M. Eriksen, A. Alarcón, A. Amara, J. Carretero, R. Casas, F. J. Castander, et al. "The PAU Survey: background light estimation with deep learning techniques." Monthly Notices of the Royal Astronomical Society 491, no. 4 (November 23, 2019): 5392–405. http://dx.doi.org/10.1093/mnras/stz3274.

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ABSTRACT In any imaging survey, measuring accurately the astronomical background light is crucial to obtain good photometry. This paper introduces BKGnet, a deep neural network to predict the background and its associated error. BKGnet has been developed for data from the Physics of the Accelerating Universe Survey (PAUS), an imaging survey using a 40 narrow-band filter camera (PAUCam). The images obtained with PAUCam are affected by scattered light: an optical effect consisting of light multiply reflected that deposits energy in specific detector regions affecting the science measurements. Fo

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6

Lee, Bomee, and Ranga-Ram Chary. "Improved photometric redshifts with colour-constrained galaxy templates for future wide-area surveys." Monthly Notices of the Royal Astronomical Society 497, no. 2 (July 17, 2020): 1935–45. http://dx.doi.org/10.1093/mnras/staa2100.

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ABSTRACT Cosmology and galaxy evolution studies with LSST, Euclid, and Roman, will require accurate redshifts for the detected galaxies. In this study, we present improved photometric redshift estimates for galaxies using a template library that populates three-colour space and is constrained by HST/CANDELS photometry. For the training sample, we use a sample of galaxies having photometric redshifts that allows us to train on a large, unbiased galaxy sample having deep, unconfused photometry at optical-to-mid infrared wavelengths. Galaxies in the training sample are assigned to cubes in 3D col

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Rau, M. M., C. B. Morrison, S. J. Schmidt, S. Wilson, R. Mandelbaum, Y.-Y. Mao, David Alonso, et al. "A composite likelihood approach for inference under photometric redshift uncertainty." Monthly Notices of the Royal Astronomical Society 509, no. 4 (November 12, 2021): 4886–907. http://dx.doi.org/10.1093/mnras/stab3290.

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ABSTRACT Obtaining accurately calibrated redshift distributions of photometric samples is one of the great challenges in photometric surveys like LSST, Euclid, HSC, KiDS, and DES. We present an inference methodology that combines the redshift information from the galaxy photometry with constraints from two-point functions, utilizing cross-correlations with spatially overlapping spectroscopic samples, and illustrate the approach on CosmoDC2 simulations. Our likelihood framework is designed to integrate directly into a typical large-scale structure and weak lensing analysis based on two-point fu

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8

Zhang, Yan-Xia, and Yong-Heng Zhao. "Photometric Redshift Techniques in Big-data Era." Proceedings of the International Astronomical Union 11, S319 (August 2015): 57. http://dx.doi.org/10.1017/s1743921315009886.

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AbstractPhotometric data increase with large survey projects running. The huge volume of data influences the means and methods to deal with them. As such, the techniques of photometric redshift estimation based on photometric data must be developed and improved.

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Ackermann, Jens, and Michael Goesele. "A Survey of Photometric Stereo Techniques." Foundations and Trends® in Computer Graphics and Vision 9, no. 3-4 (2015): 149–254. http://dx.doi.org/10.1561/0600000065.

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10

Tian, Jun, Haibin Zhao, Bin Li, Yongxiong Zhang, Jian Chen, Leonid Elenin, and Xiaoping Lu. "Photometry and Models of Seven Main-Belt Asteroids." Universe 10, no. 10 (October 14, 2024): 395. http://dx.doi.org/10.3390/universe10100395.

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The China Near-Earth Object Survey Telescope (CNEOST) conducted four photometric surveys from 2015 to 2018 using image processing and aperture photometry techniques to obtain extensive light curve data on asteroids. The second-order Fourier series method was selected for its efficiency in determining the rotation periods of the observed asteroids. Our study successfully derived rotation periods for 892 asteroids, with 648 of those matching values recorded in the LCDB (for asteroids with U > 2). To enhance the reliability of the derived spin parameters and shape models, we also amassed a com

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11

Glass, I. S. "Photometry with Infrared Arrays." International Astronomical Union Colloquium 136 (1993): 154–59. http://dx.doi.org/10.1017/s0252921100007508.

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AbstractInfrared arrays have been in use at a number of observatories for several years. They are more complicated in their construction than optical ones and more problems arise in obtaining good photometry from them. The types of arrays currently available are described together with the observational techniques and the problems encountered in obtaining accurate photometric results.

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12

Cachero, Rocio, and Carlota Abello. "Stereo-photometric techniques for scanning micrometer scale." Virtual Archaeology Review 6, no. 13 (November 24, 2015): 72. http://dx.doi.org/10.4995/var.2015.4380.

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This paper describes a new methodology based on the combination of photogrammetric and stereo-photometric techniques that allows creating virtual replicas reproducing the relief in micrometric scale, with a geometric resolution until 7 microns. The finest details of the texture obtained by photogrammetric methods are translated to the relief of the mesh to provide quality 3D printing by additive manufacturing methods. These results open new possibilities for virtual and physical reproduction of archeological items that need a great accuracy and geometric resolution.

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13

Subbarao, M. U., A. J. Connolly, A. S. Szalay, and D. C. Koo. "Luminosity Functions From Photometric Redshifts. I. Techniques." Astronomical Journal 112 (September 1996): 929. http://dx.doi.org/10.1086/118066.

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14

Newling, J., M. Varughese, B. Bassett, H. Campbell, R. Hlozek, M. Kunz, H. Lampeitl, et al. "Statistical classification techniques for photometric supernova typing." Monthly Notices of the Royal Astronomical Society 414, no. 3 (April 15, 2011): 1987–2004. http://dx.doi.org/10.1111/j.1365-2966.2011.18514.x.

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15

Chang, Kimmy, Alex Cabello, Jeff Houchard, Jonathan Gazak, and Justin Fletcher. "Leveraging Synthetic Data for Star and Satellite Photometry." American Journal of Optics and Photonics 12, no. 2 (September 29, 2024): 18–29. http://dx.doi.org/10.11648/j.ajop.20241202.11.

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In the realm of Space Domain Awareness (SDA), precise photometric measurements are essential for applications such as stability analysis, shape recovery, and material studies of satellites. However, current methods that rely on manual data collection and analysis are not scalable to autonomous frameworks, which are increasingly necessary due to the growing congestion in space. This research presents an approach to automate photometric measurements within a network of telescopes operating in non-ideal conditions. Our work focuses on achieving reliable photometry in degraded weather conditions,

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16

Jewitt, D. "Cometary Photometry." International Astronomical Union Colloquium 116, no. 1 (1989): 19–65. http://dx.doi.org/10.1017/s0252921100109625.

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AbstractThe study of comets using modern optical photometric techniques is reviewed. Particular emphasis is given to the physical constraints imposed on the nature of comets by photometric data. The photometric study of bare nuclei and of active comets is discussed.

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17

Strassmeier, Klaus G. "The zoo of starspots." Proceedings of the International Astronomical Union 6, S273 (August 2010): 174–80. http://dx.doi.org/10.1017/s1743921311015201.

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AbstractStarspots are being observed with many different techniques but not always with coherent results. In particular not if model-dependent data analysis must be employed, e.g. through two-dimensional spot modelling of one-dimensional photometric light curves. I review the zoo of currently available physical spot parameters, i.e. their size, temperature and variability time scales, and also compare results from different techniques. Most of the current values come from Doppler imaging and multi-color photometry. I also list a few cases where starspot detections turned out to be very differe

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18

Hudgins, David W., and Miroslav D. Filipović. "Photometric Techniques Using Small College Research Instruments for Study of the Extrasolar Planetary Transits of HD 209458." Publications of the Astronomical Society of Australia 19, no. 4 (2002): 443–47. http://dx.doi.org/10.1071/as02007.

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AbstractWe present the results of a program to develop techniques that enable high-resolution photometric measurements using modest research instruments available to small colleges, and then demonstrate those techniques in a pilot photometric project.Using a 25 cm Schmidt–Cassegrain telescope and SBIG ST7E CCD camera, we develop techniques that enabled milli-magnitude photometric resolution. The pilot project studied five transits of the recently discovered gas giant planet orbiting HD 209458. We measured a flux drop of 1.46 ± 0.17% during the transit which corresponds to a planetary diameter

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19

Merlin, E., M. Castellano, P. Santini, G. Cipolletta, K. Boutsia, C. Schreiber, F. Buitrago, et al. "The ASTRODEEP-GS43 catalogue: New photometry and redshifts for the CANDELS GOODS-South field." Astronomy & Astrophysics 649 (May 2021): A22. http://dx.doi.org/10.1051/0004-6361/202140310.

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Context. We present ASTRODEEP-GS43, a new multi-wavelength photometric catalogue of the GOODS-South field, which builds and improves upon the previously released CANDELS catalogue. Aims. We provide photometric fluxes and corresponding uncertainties in 43 optical and infrared bands (25 wide and 18 medium filters), as well as the photometric redshifts and physical properties of the 34930 CANDELS H-detected objects, plus an additional sample of 178 H-dropout sources, of which 173 are Ks-detected and five are IRAC-detected. Methods. We keep the CANDELS photometry in seven bands (CTIO U, Hubble Spa

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20

Read, S. C., D. J. B. Smith, M. J. Jarvis, and G. Gürkan. "The performance of photometric reverberation mapping at high redshift and the reliability of damped random walk models." Monthly Notices of the Royal Astronomical Society 492, no. 3 (December 20, 2019): 3940–59. http://dx.doi.org/10.1093/mnras/stz3574.

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ABSTRACT Accurate methods for reverberation mapping using photometry are highly sought after since they are inherently less resource intensive than spectroscopic techniques. However, the effectiveness of photometric reverberation mapping for estimating black hole masses is sparsely investigated at redshifts higher than z ≈ 0.04. Furthermore, photometric methods frequently assume a damped random walk (DRW) model, which may not be universally applicable. We perform photometric reverberation mapping using the javelin photometric DRW model for the QSO SDSS-J144645.44+625304.0 at z = 0.351 and esti

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21

Butler, R. F., A. Shearer, R. M. Redfern, M. Colhoun, P. O'Kane, A. J. Penny, P. W. Morris, W. K. Griffiths, and M. Cullum. "TRIFFID photometry of globular cluster cores - I. Photometric techniques and variable stars in M15." Monthly Notices of the Royal Astronomical Society 296, no. 2 (May 11, 1998): 379–91. http://dx.doi.org/10.1046/j.1365-8711.1998.01359.x.

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22

Koornneef, J., R. Bohlin, R. Buser, K. Horne, and D. Turnshek. "Synthetic Photometry and the Calibration of the Hubble Space Telescope." Highlights of Astronomy 7 (1986): 833–43. http://dx.doi.org/10.1017/s153929960000736x.

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AbstractThe combined Scientific Instruments (SIs) on the Hubble Space Telescope (HST) feature an extensive wavelength coverage in both photometric and spectrophotometric modes with an overall dynamic range of more than twenty-five magnitudes. We demonstrate how synthetic photometry techniques are to be used to establish and maintain their calibration. This approach makes efficient use of limited HST observing time by taking full advantage of pre-launch knowledge on the SI sensitivity functions and calibration targets.

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23

Wilson, Richard, and Heide Friedrich. "Coupling of Ultrasonic and Photometric Techniques for Synchronous Measurements of Unconfined Turbidity Currents." Water 10, no. 9 (September 14, 2018): 1246. http://dx.doi.org/10.3390/w10091246.

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By synchronizing data collection, such as photometric and ultrasonic Doppler profiling (UVP) measurement techniques, new insights can be obtained into environmental flows, such as highly dynamic turbidity currents. We introduce a combined experimental setup, which ultimately allows a time reduction in testing programmes, and discuss the measurement advances with the help of four surface conditions we tested for unconfined turbidity currents: (a) a smooth surface; (b) a smooth surface with an obstacle present; (c) a rough surface; and (d) a rough surface with an obstacle present. We show that d

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24

Stritzinger, M. D., J. P. Anderson, C. Contreras, E. Heinrich-Josties, N. Morrell, M. M. Phillips, J. Anais, et al. "The Carnegie Supernova Project I." Astronomy & Astrophysics 609 (January 2018): A134. http://dx.doi.org/10.1051/0004-6361/201730842.

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The first phase of the Carnegie Supernova Project (CSP-I) was a dedicated supernova follow-up program based at the Las Campanas Observatory that collected science data of young, low-redshift supernovae between 2004 and 2009. Presented in this paper is the CSP-I photometric data release of low-redshift stripped-envelope core-collapse supernovae. The data consist of optical (uBgVri) photometry of 34 objects, with a subset of 26 having near-infrared (YJH) photometry. Twenty objects have optical pre-maximum coverage with a subset of 12 beginning at least five days prior to the epoch of B-band maxi

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25

Cho, Hanjin, Siwoo Lee, and Byoungho Lee. "Optical design of photometric techniques for specular reflection." Optics and Lasers in Engineering 151 (April 2022): 106882. http://dx.doi.org/10.1016/j.optlaseng.2021.106882.

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Anderson, Jay. "Photometric Techniques for Exploring Multiple Populations in Clusters." Proceedings of the International Astronomical Union 10, H16 (August 2012): 239–40. http://dx.doi.org/10.1017/s1743921314005584.

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AbstractThe advent of the Hubble Space Telescope (HST) and the development of new photometric algorithms that take advantage of its stable observing platform above the atmosphere have allowed us to study the populations in globular clusters with very high precision.

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27

Lumme, K., J. Peltoniemi, and W. M. Irvine. "Some photometric techniques for atmosphereless solar system bodies." Advances in Space Research 10, no. 1 (January 1990): 187–93. http://dx.doi.org/10.1016/0273-1177(90)90103-7.

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Chen, Bin, and Qingyu Peng. "Photometric techniques in mutual events of Galilean satellites." Chinese Journal of Space Science 31, no. 3 (2011): 338. http://dx.doi.org/10.11728/cjss2011.03.338.

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Karami, A., F. Menna, and F. Remondino. "INVESTIGATING 3D RECONSTRUCTION OF NON-COLLABORATIVE SURFACES THROUGH PHOTOGRAMMETRY AND PHOTOMETRIC STEREO." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2021 (June 28, 2021): 519–26. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2021-519-2021.

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Abstract. 3D digital reconstruction techniques are extensively used for quality control purposes. Among them, photogrammetry and photometric stereo methods have been for a long time used with success in several application fields. However, generating highly-detailed and reliable micro-measurements of non-collaborative surfaces is still an open issue. In these cases, photogrammetry can provide accurate low-frequency 3D information, whereas it struggles to extract reliable high-frequency details. Conversely, photometric stereo can recover a very detailed surface topography, although global surfa

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Barry, D. J., W. G. Bagnuolo, B. D. Mason, H. A. McAlister, and N. H. Turner. "Prospects for Rapid, Routine Speckle Photometry." International Astronomical Union Colloquium 135 (1992): 537–39. http://dx.doi.org/10.1017/s0252921100007077.

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Image reconstruction techniques have rapidly matured over the last decade, and increasing reference to full–aperture and masked aperture results appear in the literature. Although anomalies in morphology are understood, most work uses nonlinear iterative refinements of questionable photometric robustness. Recent development of linear least–squares phase reconstruction techniques from the bispectrum (Glindemann et al. 1991) offers hope for a robust technique using a computational tour de force. However, the field cannot be considered mature until routine photometry of a large number of speckle–

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Maíz Apellániz, J., E. J. Alfaro, R. H. Barbá, G. Holgado, H. Vázquez-Ramió, J. Varela, A. Ederoclite, et al. "The GALANTE photometric survey of the northern Galactic plane: project description and pipeline." Monthly Notices of the Royal Astronomical Society 506, no. 3 (July 2, 2021): 3138–54. http://dx.doi.org/10.1093/mnras/stab1769.

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ABSTRACT The GALANTE optical photometric survey is observing the northern Galactic plane and some adjacent regions using seven narrow- and intermediate-filters, covering a total of 1618 deg2. The survey has been designed with multiple exposure times and at least two different air masses per field to maximize its photometric dynamic range, comparable to that of Gaia, and ensure the accuracy of its photometric calibration. The goal is to reach at least 1 per cent accuracy and precision in the seven bands for all stars brighter than AB magnitude 17 while detecting fainter stars with lower values

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Kreidl, T. J. "Time-Series Photometry: CCDs vs. PMTs." International Astronomical Union Colloquium 136 (1993): 311–17. http://dx.doi.org/10.1017/s0252921100007703.

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AbstractWith the ability to obtain simultaneous photometry of many objects, CCD time-series photometry is a potentially powerful method for obtaining data, even under non-photometric conditions. In particular, the ability to utilize one or more comparison stars on the same frame without the need to move the telescope to a different field makes for a higher duty cycle than conventional photoelectric photometry. In addition, the ability to determine the local sky in a variety of ways plus the ability to use more complex analysis techniques such as profile fitting and curves of growth permits a v

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Maireles-González, Òscar, Joan Bartrina-Rapesta, Miguel Hernández-Cabronero, and Joan Serra-Sagristà. "Lossy Compression of Integer Astronomical Images Preserving Photometric Properties*." Publications of the Astronomical Society of the Pacific 136, no. 11 (November 1, 2024): 114506. http://dx.doi.org/10.1088/1538-3873/ad8b69.

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Abstract Observatories are producing astronomical image data at quickly increasing rates. As a result, the efficiency of the compression methods employed is critical to meet the storage and distribution requirements of both observatories and scientists. This paper presents a novel lossy compression technique that is able to preserve the results of photometry analysis with high fidelity while improving upon the state of the art in terms of compression performance. The proposed compression pipeline combines a flexible bi-region quantization scheme with the lossless, dictionary-based, LPAQ9M enco

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Mélou, J., A. Laurent, C. Fritz, and J. D. Durou. "3D DIGITIZATION OF HERITAGE: PHOTOMETRIC STEREO CAN HELP." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-2/W1-2022 (December 8, 2022): 145–52. http://dx.doi.org/10.5194/isprs-archives-xlviii-2-w1-2022-145-2022.

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Abstract. There are mainly two families of photographic 3D reconstruction. Photogrammetry techniques work according to the principle of triangulation, from the matching of different views, while photometric techniques link the appearance of a 3D point to the orientation of its normal, relative to the direction of the incident light. While photogrammetry allows to find the global shape of a 3D scene, if it is sufficiently textured, photometric techniques highlight the details of the relief, as long as the model linking the lighting to the shape and reflectance of the scene is sufficiently reali

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Stobie, R. S., D. Kilkenny, D. O’Donoghue, and A. Chen. "The Edinburgh-Cape Blue Object Survey." International Astronomical Union Colloquium 148 (1995): 280–91. http://dx.doi.org/10.1017/s0252921100022041.

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AbstractThe Edinburgh-Cape Blue Object Survey is a major survey to discover blue stellar objects brighter than B ∼ 18 in the southern sky. It covers an area of sky of 10,000 square degrees with |b| > 30° and δ < 0°. The blue stellar objects are selected by automatic techniques from U and B pairs of UK Schmidt Telescope plates scanned with the COSMOS measuring machine. Follow-up photometry and spectroscopy are being obtained with the SAAO telescopes to classify objects brighter than B = 16.5. This paper describes the survey, the techniques used to extract the blue stellar objects, the pho

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Cooke, Benjamin F., and Don Pollacco. "specphot: a comparison of spectroscopic and photometric exoplanet follow-up methods." Monthly Notices of the Royal Astronomical Society 495, no. 1 (May 8, 2020): 734–42. http://dx.doi.org/10.1093/mnras/staa1194.

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ABSTRACT We set out a simulation to explore the follow-up of exoplanet candidates. We look at comparing photometric (transit method) and spectroscopic (Doppler shift method) techniques using three instruments: Next-Generation Transit Survey, High-Accuracy Radial-velocity Planetary Search, and CORALIE. We take into account the precision of follow-up and required observing time in attempt to rank each method for a given set of planetary system parameters. The methods are assessed on two criteria: signal-to-noise ratio (S/N) of the detection and follow-up time before characterization. We find tha

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Duque-Arribas, C., D. Montes, H. M. Tabernero, J. A. Caballero, J. Gorgas, and E. Marfil. "Photometric Calibrations of M-dwarf Metallicity with Markov Chain Monte Carlo and Bayesian Inference." Astrophysical Journal 944, no. 1 (February 1, 2023): 106. http://dx.doi.org/10.3847/1538-4357/acacf6.

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Abstract Knowledge of stellar atmospheric parameters (T eff, log g , [Fe/H]) of M dwarfs can be used to constrain both theoretical stellar models and Galactic chemical evolutionary models, and guide exoplanet searches, but their determination is difficult due to the complexity of the spectra of their cool atmospheres. In our ongoing effort to characterize M dwarfs, and in particular their chemical composition, we carried out multiband photometric calibrations of metallicity for early- and intermediate-type M dwarfs. The third Gaia data release provides high-precision astrometry and three-band

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Andrade, Laerte, Alan W. Pereira, Marcelo Emilio, and Eduardo Janot-Pacheco. "Exploring the Variability of Three Be Stars with TESS Observations." Universe 11, no. 2 (February 18, 2025): 71. https://doi.org/10.3390/universe11020071.

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Be stars are rapidly rotating B-type stars surrounded by circumstellar disks formed from self-ejected material. Understanding the mechanisms driving mass ejection and disk formation, known as the Be phenomenon, requires a detailed investigation of their variability and underlying physical processes. In this study, we analyze the photometric, spectroscopic, and seismic characteristics of three Be stars—HD 212044, 28 Cyg, and HD 174237—using high-cadence data from the TESS mission and spectral data from the BeSS database. Photometric variability was analyzed through iterative prewhitening and wa

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Landolt, A. U., P. Martinez, P. Bastien, S. Fabrika, R. Gilliland, F. Grundahl, C. Jordi, and U. Munari. "Commission 25: Stellar Photometry and Polarimetry." Proceedings of the International Astronomical Union 1, T26A (December 2005): 307–12. http://dx.doi.org/10.1017/s1743921306004753.

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AbstractEven a brief glance at astronomical journals indicates the breadth and depth of observational projects making use of photometric and polarimetric techniques. Examples of ongoing photometric and polarimetric research as related by Commission Members follows. I thank the Commission Members, acknowledged below, for their input.

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Altena, B., A. Mousivand, J. Mascaro, and A. Kääb. "POTENTIAL AND LIMITATIONS OF PHOTOMETRIC RECONSTRUCTION THROUGH A FLOCK OF DOVE CUBESATS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W3 (October 19, 2017): 7–11. http://dx.doi.org/10.5194/isprs-archives-xlii-3-w3-7-2017.

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When Earth observation satellite systems are designed, one typically prefers a sun-synchronous orbit. However, the first generations of cubesats from Planet were deployed out of the International Space Station (ISS) and therefore do not obey such an orbit. Their configuration samples at different local times within the mid-latitudes. Consequently, it is in theory possible to exploit photometric techniques and extract highly detailed topographic information. In this study we demonstrate and explore photometry based on Planet cubesat images for Tyndall glacier at the Southern Patagonian icefield

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Maskoliunas, M., J. Zdanavičius, V. Čepas, A. Kazlauskas, R. P. Boyle, K. Zdanavičius, K. Černis, K. Milašius, and M. Macijauskas. "New calibration of the Vilnius photometric system." Proceedings of the International Astronomical Union 14, A30 (August 2018): 486. http://dx.doi.org/10.1017/s1743921319005179.

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AbstractThe medium-band Vilnius photometric system with the mean wavelengths at 345 (U), 374 (P), 405 (X), 466 (Y), 516 (Z), 544 (V), and 656 (S) nm for many years was an important tool to determine interstellar reddenings and distances of single stars due to its ability to classify stars of all temperatures in spectral classes and luminosity classes in the presence of different interstellar reddenings. At present, Gaia DR2 presents distances to stars with an unprecedented accuracy at least up to 3 kpc. However, multicolor photometry, which allows the classification of stars as well as the pre

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Curran, S. J. "QSO photometric redshifts from SDSS, WISE, and GALEX colours." Monthly Notices of the Royal Astronomical Society: Letters 493, no. 1 (January 21, 2020): L70—L75. http://dx.doi.org/10.1093/mnrasl/slaa012.

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ABSTRACT Machine learning techniques, specifically the k-nearest neighbour algorithm applied to optical band colours, have had some success in predicting photometric redshifts of quasi-stellar objects (QSOs): Although the mean of differences between the spectroscopic and photometric redshifts, Δ$z$, is close to zero, the distribution of these differences remains wide and distinctly non-Gaussian. As per our previous empirical estimate of photometric redshifts, we find that the predictions can be significantly improved by adding colours from other wavebands, namely the near-infrared and ultravio

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Hviding, Raphael E., Kevin N. Hainline, Andy D. Goulding, and Jenny E. Greene. "Spectroscopic Confirmation of Obscured AGN Populations from Unsupervised Machine Learning." Astronomical Journal 167, no. 4 (March 19, 2024): 169. http://dx.doi.org/10.3847/1538-3881/ad28b4.

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Abstract We present the result of a spectroscopic campaign targeting active galactic nucleus (AGN) candidates selected using a novel unsupervised machine-learning (ML) algorithm trained on optical and mid-infrared photometry. AGN candidates are chosen without incorporating prior AGN selection criteria and are fainter, redder, and more numerous, ∼340 AGN deg−2, than comparable photometric and spectroscopic samples. In this work, we obtain 178 rest-optical spectra from two candidate ML-identified AGN classes with the Hectospec spectrograph on the MMT Observatory. We find that our first ML-identi

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ITO, SHIN'ICHI. "Recycling. Physical Separation Techniques. Hand Picking and Photometric Sorting." Shigen-to-Sozai 113, no. 12 (1997): 908–11. http://dx.doi.org/10.2473/shigentosozai.113.908.

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Carlson, Paul J., and Thomas Urbanik. "Validation of Photometric Modeling Techniques for Retroreflective Traffic Signs." Transportation Research Record: Journal of the Transportation Research Board 1862, no. 1 (January 2004): 109–18. http://dx.doi.org/10.3141/1862-13.

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MACHIDA, Kenichiro, Harutaka IMOTO, and Takashi MAEKAWA. "1108 Development of Inspection System Using Photometric Stereo Techniques." Proceedings of Design & Systems Conference 2015.25 (2015): _1108–1_—_1108–6_. http://dx.doi.org/10.1299/jsmedsd.2015.25._1108-1_.

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Lapasset, E., M. Gomez, and R. Fariñas. "Test of the Optimization Techniques for the Photometric Analysis of Contact Binaries." Symposium - International Astronomical Union 151 (1992): 387–90. http://dx.doi.org/10.1017/s0074180900122545.

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We present light curve analyses of contact binaries and comparisons with previously published cross-correlations radial velocity data. The critical parameter q (mass-ratio) obtained from a grid technique is confronted with the spectroscopic value. For total eclipsing systems, both values are always in a good or reasonable agreement, including some stars with shallow light curves. For partial eclipsing systems, convergent photometric and spectroscopic results are obtained for an important set of stars. Two exceptions are V523 Cas and XY Boo for which some arguments are suggested. We concluded t

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48

Han, Yunkun, Lulu Fan, Xian Zhong Zheng, Jin-Ming Bai, and Zhanwen Han. "BayeSED-GALAXIES. I. Performance Test for Simultaneous Photometric Redshift and Stellar Population Parameter Estimation of Galaxies in the CSST Wide-field Multiband Imaging Survey." Astrophysical Journal Supplement Series 269, no. 2 (November 15, 2023): 39. http://dx.doi.org/10.3847/1538-4365/acfc3a.

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Abstract The forthcoming Chinese Space Station Telescope (CSST) wide-field multiband imaging survey will produce seven-band photometric spectral energy distributions (SEDs) for billions of galaxies. The effective extraction of astronomical information from these massive data sets of SEDs relies on the techniques of SED synthesis (or modeling) and SED analysis (or fitting). We evaluate the performance of the latest version of the BayeSED code combined with SED models with increasing complexity for simultaneously determining the photometric redshifts and stellar population parameters of galaxies

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Cavuoti, S., C. Tortora, M. Brescia, G. Longo, M. Radovich, N. R. Napolitano, V. Amaro, and C. Vellucci. "Cooperative photometric redshift estimation." Proceedings of the International Astronomical Union 12, S325 (October 2016): 166–72. http://dx.doi.org/10.1017/s1743921317001296.

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AbstractIn the modern galaxy surveys photometric redshifts play a central role in a broad range of studies, from gravitational lensing and dark matter distribution to galaxy evolution. Using a dataset of ~ 25,000 galaxies from the second data release of the Kilo Degree Survey (KiDS) we obtain photometric redshifts with five different methods: (i) Random forest, (ii) Multi Layer Perceptron with Quasi Newton Algorithm, (iii) Multi Layer Perceptron with an optimization network based on the Levenberg-Marquardt learning rule, (iv) the Bayesian Photometric Redshift model (or BPZ) and (v) a classical

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Brooks, Hunter, Dan Caselden, J. Davy Kirkpatrick, Yadukrishna Raghu, Charles A. Elachi, Jake Grigorian, Asa Trek, et al. "Discovery of 118 New Ultracool Dwarf Candidates Using Machine-learning Techniques." Astronomical Journal 168, no. 5 (October 17, 2024): 211. http://dx.doi.org/10.3847/1538-3881/ad77d2.

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Abstract We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine-learning tool, named SMDET, applied to time-series images from the Wide-field Infrared Survey Explorer. We gathered photometric and astrometric data to estimate each candidate’s spectral type, distance, and tangential velocity. This sample has a photometrically estimated spectral class distribution of 28 M dwarfs, 64 L dwarfs, and 18 T dwarfs. We also identify a T-subdwarf candidate, two extreme T-subdwarf candidates, and two candidate young ultracool dwarfs. Five objects did not have enough

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