Relevant bibliographies by topics / Binary stars Survey SARG

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Binary stars Survey SARG'

Author: Grafiati
Published: 9 March 2023

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Journal articles on the topic "Binary stars Survey SARG"

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Ratajczak, Milena, Maciej Konacki, Shrinivas R. Kulkarni, and Matthew W. Muterspaugh. "The Keck I/HIRES and TNG/SARG Radial Velocity Survey of Speckle Binaries." Proceedings of the International Astronomical Union 7, S282 (July 2011): 472–73. http://dx.doi.org/10.1017/s1743921311028146.

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AbstractA sample of about 160 speckle binary stars was observed with the Keck I telescope and its Échelle HIRES spectrograph over the years 2003-2007 in an effort to detect substellar and planetary companions to components of binary and multiple star systems. This data set was supplemented with the data obtained at the TNG telescope equipped with the SARG Échelle spectrograph over the years 2006-2007. The high-resolution (R = 65000 for HIRES and R = 86000 for SARG) and high signal-to-noise (typically 75-150) spectra were used to derive radial velocities of the components of the observed speckle binaries. Here, we present a summary of this effort, which includes the discovery of new triple star systems and improved orbital solutions of a few known binaries.
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Carolo, Elena, Silvano Desidera, Raffaele Gratton, Aldo Martinez Fiorenzano, Michael Endl, Rosario Cosentino, Mauro Barbieri, et al. "Planet candidates from the SARG visual binary survey." Proceedings of the International Astronomical Union 6, S276 (October 2010): 403–4. http://dx.doi.org/10.1017/s1743921311020539.

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Sissa, E., R. Gratton, S. Desidera, A. F. Martinez Fiorenzano, A. Bonfanti, E. Carolo, D. Vassallo, R. U. Claudi, M. Endl, and R. Cosentino. "Hα-activity and ages for stars in the SARG survey." Astronomy & Astrophysics 596 (December 2016): A76. http://dx.doi.org/10.1051/0004-6361/201628531.

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Matijevič, G., T. Zwitter, and U. Munari. "Binary stars in the RAVE survey." EPJ Web of Conferences 19 (2012): 09006. http://dx.doi.org/10.1051/epjconf/20121909006.

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Traven, G., S. Feltzing, T. Merle, M. Van der Swaelmen, K. Čotar, R. Church, T. Zwitter, et al. "The GALAH survey: multiple stars and our Galaxy." Astronomy & Astrophysics 638 (June 2020): A145. http://dx.doi.org/10.1051/0004-6361/202037484.

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Context. Binary stellar systems form a large fraction of the Galaxy’s stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be correctly taken into account when observations of stars are used to study the structure and evolution of the Galaxy. The advent of large-scale spectroscopic and photometric surveys allows us to obtain large samples of binaries that permit characterising their populations. Aims. We aim to obtain a large sample of double-lined spectroscopic binaries (SB2s) by analysis of spectra from the GALAH survey in combination with photometric and astrometric data. A combined analysis will provide stellar parameters of thousands of binary stars that can be combined to form statistical observables of a given population. We aim to produce a catalogue of well-characterised systems, which can in turn be compared to models of populations of binary stars, or to follow-up individual systems of interest. Methods. We obtained a list of candidate SB2 systems from a t-distributed stochastic neighbour embedding (t-SNE) classification and a cross-correlation analysis of GALAH spectra. To compute parameters of the primary and secondary star, we used a Bayesian approach that includes a parallax prior from Gaia DR2, spectra from GALAH, and apparent magnitudes from APASS, Gaia DR2, 2MASS, and WISE. We used a Markov chain Monte Carlo approach to sample the posterior distributions of the following model parameters for the two stars: Teff[1,2], logg[1,2], [Fe/H], Vr[1,2], vmic[1,2], vbroad[1,2], R[1,2], and E(B−V). Results. We present results for 12 760 binary stars detected as SB2s. We construct the statistical observables T1∕T2, ΔVr, and R1∕R2, which demonstrate that our sample mostly consists of dwarfs, with a significant fraction of evolved stars and several dozen members of the giant branch. The majority of these binary stars is concentrated at the lower boundary of the ΔVr distribution, and the R1∕R2 ratio is mostly close to unity. The derived metallicity of our binary stars is statistically lower than that of single dwarf stars from the same magnitude-limited sample. Conclusions. Our sample of binary stars represents a large population of well-characterised double-lined spectroscopic binaries that are appropriate for statistical studies of the binary populations. The derived stellar properties and their distributions show trends that are expected for a population of close binary stars (a < 10 AU) detected through double lines in their spectra. Our detection technique allows us to probe binary systems with mass ratios 0.5 ≤q ≤ 1.
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Martínez Fiorenzano, A. F., R. G. Gratton, S. Desidera, R. Cosentino, M. Cecconi, and M. Endl. "Line bisector analysis of stars with companions in the SARG survey at the TNG." EAS Publications Series 42 (2010): 137–41. http://dx.doi.org/10.1051/eas/1042013.

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Baade, Dietrich. "Binary Be Stars and Be Binaries." Symposium - International Astronomical Union 151 (1992): 147–56. http://dx.doi.org/10.1017/s0074180900122144.

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Two hypotheses have been put forward for the rôle of binarity in Be stars: (1) All Be stars are interacting binaries. (2) Roughly one-half of the observed Be stars are post-mass exchange binaries with compact companions. Contrary to (1), (2) does not attempt to explain also the existence of disks in Be stars. After the spin-up by mass and angular momentum transfer, the B star somehow has to succeed to form and maintain the disk. Since rapid rotation is only necessary but not sufficient for this transformation, the effect of duplicity would merely be to give more stars the opportunity to become a Be star. Model (1) is not nearly realistic as is also underlined by a new spectroscopic survey for cool companions. The verification of (2) on the basis of the ROSAT All-Sky Survey has just begun; but a serious deficiency of white dwarf companions is already apparent. Binarity currently provides no extra clue on the origin of the Be phenomenon.
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Bergfors, Carolina, Wolfgang Brandner, Stefan Hippler, Thomas Henning, Markus Janson, and Felix Hormuth. "The AstraLux Binary M Dwarfs Survey." Proceedings of the International Astronomical Union 7, S282 (July 2011): 460–61. http://dx.doi.org/10.1017/s1743921311028080.

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AbstractBinary/multiple properties provide clues to the formation of stars. In the AstraLux binary survey, we use the Lucky Imaging technique to search for companions to a large sample of young, nearby M dwarfs. We present results from observations of the first sub-sample, consisting of 124 M dwarfs in the southern sky.
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Ritchie, B. W., J. S. Clark, I. Negueruela, and F. Najarro. "A VLT/FLAMES survey for massive binaries in Westerlund 1." Astronomy & Astrophysics 660 (April 2022): A89. http://dx.doi.org/10.1051/0004-6361/202142405.

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Context. The galactic cluster Westerlund 1 contains a rich population of evolved, massive stars. A high binary fraction has been inferred from previous multi-wavelength observations. Aims. We use multi-epoch spectroscopy of a large sample of early-type stars in Westerlund 1 to identify new binaries and binary candidates in the cluster. Methods. VLT/FLAMES was used with the GIRAFFE spectrograph in HR21 mode to obtain spectra of ∼100 OB stars over a 14-month baseline in 2008 and 2009, supplemented with follow-up observations in 2011 and 2013. Radial velocities were obtained from strong Paschen series absorption lines in the I-band. Results. We identify 20 new OB I–III binaries, a WN9h binary, and a WC9d binary, greatly increasing the number of directly confirmed binary systems in Westerlund 1, while 12 O9−9.5 Iab−III stars are identified as candidate binaries based on radial velocity changes that are inconsistent with photospheric variability. The 173.9 day SB1 W1030 represents the first longer-period system identified in the cluster, while the determination of a 53.95 day period for W44 (WR L) makes it the first Wolf-Rayet binary in Westerlund 1 with a confirmed orbital period greater than ten days. Our results suggest the binary fraction in the OB population is at least ∼40%, and may be significantly higher. Conclusions. These results demonstrate that binary systems can be effectively identified in the population of OB I−III stars evolving off the main sequence in Westerlund 1. Future multi-epoch surveys will be able to fully characterise this population.
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Budding, E., O. B. Slee, and K. Jones. "Further Discussion of Binary Star Radio Survey Data." Publications of the Astronomical Society of Australia 15, no. 2 (1998): 183–88. http://dx.doi.org/10.1071/as98183.

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AbstractStatistical information on 8280 individual radio observations of binary stars, predominantly at 8·4 GHz using the Parkes 64 m antenna, is presented. Three main groups are distinguished: (i) RS CVn stars, (ii) classical Algol binaries (EA2s), and (iii) detached pairs of generally early type (ETBs).The RS CVn stars more frequently gave rise to detectable fluxes, while the ETBs, in these data, are a small and rather heterogeneous class. The Algols' emission appears to increase near conjunction phases, though we cannot clearly distinguish any special property of the Algols' phase-dependent behaviour that is not also shared by the RS CVn binaries. Both these categories' data show a bimodal, phase-dependent pattern to the distribution of detections, suggesting that these binary types share similar underlying physical properties, though there could also be other factors at play. The sample sizes of the Algols and particularly the ETB detections are too small for effective, discriminatory statistics, however.
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Dissertations / Theses on the topic "Binary stars Survey SARG"

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Hlabathe, Michael. "Post-common-envelope binary central stars of Planetary Nebulae in the OGLE-IV survey." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20870.

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Planetary Nebulae (PNe) are defined as the ionized shells of circumstellar gas ejected through an intense stellar wind at the end of the star's life. PNe come in different shapes, from spherical to highly complex, non-spherical shapes. Mass loss in AGB stars is presumed as the shaping mechanism but how it results in different PNe morphologies is still unclear. Binary central stars that have undergone common envelope evolution are thought to be a possible solution to this longstanding problem. Using photometry from the OGLEIV survey, we present the newly identified close binary central stars of Planetary Nebulae (CSPNe), six in total. Of the six PNe with close binary CSPNe, one looks spherical which presents a very interesting argument in terms of our understanding of PNe evolution. The orbital distribution is derived and compared against current orbital distribution for binary CSPNe, with most binaries from the distribution exhibiting orbital periods less than a day. A binary fraction estimate of 6% is presented and possible cases are discussed that might have influenced our estimation to be different from the expected 10-15%.
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Raghavan, Deepak. "A Survey of Stellar Families: Multiplicity of Solar-type Stars." unrestricted, 2009. http://etd.gsu.edu/theses/available/etd-04212009-165714/.

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Thesis (Ph. D.)--Georgia State University, 2009.
Title from file title page. Harold A. McAlister, committee chair; Russel J. White, Brian D. Mason, Douglas R. Gies, David W. Latham, A.G. Unil Perera, Todd J. Henry, committee members. Description based on contents viewed Aug. 24, 2009. Includes bibliographical references (p. 391-410).
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Kaderhandt, Lena Maria [Verfasser], Rolf [Gutachter] Chini, and Horst [Gutachter] Fichtner. "B-type eclipsing binary stars in the Bochum Galactic Disk Survey / Lena Maria Kaderhandt ; Gutachter: Rolf Chini, Horst Fichtner." Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1127334875/34.

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Schnurr, Olivier. "A spectroscopic survey of the WNL stars in the large magellanic cloud : general properties and binary status." Thèse, 2007. http://hdl.handle.net/1866/18113.

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Book chapters on the topic "Binary stars Survey SARG"

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Drake, S. A., Theodore Simon, and J. L. Linsky. "A VLA Radio Continuum Survey of Active Late-Type Giants in Binary Systems: Preliminary Results." In Radio Stars, 253–58. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5420-5_36.

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Bell, S. A., and D. L. Pollacco. "A New Deep Imaging Survey of Planetary Nebulae with known Binary Central Stars." In Planetary Nebulae, 210. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5244-0_69.

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Agrawal, Ravi. "Lord Kāmadeva’s Digital Bow: Dating and Marriage." In India Connected. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190858650.003.0009.

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When simran arora returned to New Delhi from London, master’s degree in hand, her parents welcomed her with an enough-is-enough ultimatum: she was twenty-six, and it was time to settle down with a good Punjabi boy of their choosing. “I said sure, why not,” recounted Simran, four years older (and wiser, as I was to find out). “If the guy is Mr. Right, who cares if it’s an arranged marriage?” Simran isn’t her real name. She asked me to keep her identity secret because she didn’t want her family and friends to learn the details she was about to tell me. “It’s a complicated, messy, crazy story,” she warned me. Simran’s willingness to be matched by her parents was not unusual. The 2012 India Human Development Survey found that a mere 5 percent of women picked their own husbands; 22 percent made their choices along with their parents or other relatives, and 73 percent had their spouses picked for them with no active say. When marriages are “arranged,” parents usually filter candidates based on compatibilities of caste, class, and family. In many cases, the stars must be aligned—quite literally—as astrological charts are matched to ensure a future of marital harmony. Not everyone follows convention. A small but growing number of Indians, mostly young urban professionals, dismiss the prospect of being set up. Their alternative is the curiously named “love marriage”—a union that implies not only the serendipity of falling for someone but also a proactive, defiant choice. Adding the prefix “love” attaches a hint of illicit romance to what is known in most other parts of the world as, simply, marriage. The choice isn’t always binary. Sometimes unions nestle between “arranged” and “love.” There is, for example, the increasingly common “arranged-to-love” approach, where old-school-but-liberal parents allow a family-matched couple to go on several dates in the hope of Cupid doing his thing. (Incidentally, Indians have their own version of the Greek god: the Lord Kāmadeva is often depicted as a handsome man with green skin, wielding a sugarcane bow with a bowstring of honeybees.
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Conference papers on the topic "Binary stars Survey SARG"

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Horch, Elliott P., William F. van Altena, J. A. Docobo, V. S. Tamazian, and Y. Y. Balega. "The WIYN Speckle Survey: Toward the Thin and Thick Disk Binary Populations." In INTERNATIONAL WORKSHOP ON DOUBLE AND MULTIPLE STARS: DYNAMICS, PHYSICS, AND INSTRUMENTATION. AIP, 2011. http://dx.doi.org/10.1063/1.3597583.

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Thalmann, Christian, Miwa Goto, Joseph Carson, Markus Feldt, Thomas Henning, Yoichi Itoh, Markus Janson, et al. "SPOTS: Search for Planets Of Two Stars—A Direct Imaging Survey for Exoplanets in Binary Systems." In EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3215867.

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Close, Laird M., Nicholas Siegler, and Melanie E. Freed. "Hokupa'a/Gemini survey of the lowest mass/faintest guide stars: the very low mass binary population and its implications for brown dwarf formation theories." In Astronomical Telescopes and Instrumentation, edited by Peter L. Wizinowich and Domenico Bonaccini. SPIE, 2003. http://dx.doi.org/10.1117/12.458958.

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