Relevant bibliographies by topics / Nebular diagnostics

Contents

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

Academic literature on the topic 'Nebular diagnostics'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Nebular diagnostics"

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Stasińska, Grazyna, Daniel Schaerer, and Claude J. Zeippen. "Nebular diagnostics of hot star atmospheres." Symposium - International Astronomical Union 212 (2003): 481–86. http://dx.doi.org/10.1017/s0074180900212679.

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The ionization structure of nebulae depends on the spectral energy distribution of the ionizing stars. Therefore nebulae are potential tools to check the validity of the energy distribution predicted by stellar atmosphere models. However, the problem is complicated by the fact that the ionization structure also depends on the nebular density distribution and that the predictions of photo-ionization models strongly rely on atomic physics computations, which bear their own uncertainties.
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Canal, R., and P. Ruiz-Lapuente. "SNIa Diversity: Theory and Diagnostics." International Astronomical Union Colloquium 145 (1996): 69–76. http://dx.doi.org/10.1017/s0252921100007922.

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Existing evidence of photometric and spectroscopic diversity among Type la supernovae is compared with the predictions from physical modeling of the explosions. Concerning light curves, changes in the central ignition density of massive (M ≃ Mch) C+O white dwarfs alone do not give appreciable variation. Spectroscopic diversity has been found in the nebular phase, the underluminous SN 1991bg providing an extreme case. A range of 0.4-0.8 Mʘ of 56Ni synthesized in the explosions is derived from the nebular spectra of a sample of SNe la. For SN 1991bg, however, a 56Ni mass of ∼ 0.1 Mʘ only is obta
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Czyzak, S. J., C. D. Keyes, and L. H. Aller. "Atomic structure calculations and nebular diagnostics." Astrophysical Journal Supplement Series 61 (May 1986): 159. http://dx.doi.org/10.1086/191110.

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Aller, L. H., and C. D. Keyes. "Some Statistics of Nebular Chemical Compositions." Symposium - International Astronomical Union 131 (1989): 219. http://dx.doi.org/10.1017/s0074180900138318.

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Data from a survey of 51 planetary nebulae (PN) observed with the image tube scanner on Shane Telescope at Lick Observatory are combined with those for a comparable number of objects previously reported. For nearly all of the PN included in the later program, it was possible to obtain adequately accurate plasma diagnostics and line intensities to derive ionic concentrations for He, N, O, Ne, S, Cl, and Ar. To get ionization correction factors we calculated theoretical nebular models to fit the excitation level and the intensities of individual important lines. Final model parameters include th
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Schaerer, Daniel, Paul A. Crowther, and M. S. Oey. "Special session on recent advances in nebular diagnostics." Symposium - International Astronomical Union 212 (2003): 777–80. http://dx.doi.org/10.1017/s0074180900213429.

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Nebular emission-line spectra offer fundamental tests for models of stellar atmospheres, and ultimately, they offer important probes of massive star properties in situations where the stars themselves are unresolved or obscured. Presentations in the first half of this special session focused on the impact of revised stellar properties for O-type and Wolf-Rayet stars on the effective temperature scale and on their Lyman continuum fluxes, whilst the second half emphasized the relationship of nebular diagnostics with stellar atmospheres.
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Morisset, Christophe, Valentina Luridiana, Jorge García-Rojas, Verónica Gómez-Llanos, Manuel Bautista, and Claudio Mendoza. "Atomic Data Assessment with PyNeb." Atoms 8, no. 4 (2020): 66. http://dx.doi.org/10.3390/atoms8040066.

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PyNeb is a Python package widely used to model emission lines in gaseous nebulae. We take advantage of its object-oriented architecture, class methods, and historical atomic database to structure a practical environment for atomic data assessment. Our aim is to reduce the uncertainties in the parameter space (line ratio diagnostics, electron density and temperature, and ionic abundances) arising from the underlying atomic data by critically selecting the PyNeb default datasets. We evaluate the questioned radiative-rate accuracy of the collisionally excited forbidden lines of the N- and P-like
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Xiao, Lin, J. J. Eldridge, Elizabeth Stanway, and L. Galbany. "Emission-line Diagnostics of Nearby HII Regions Including Supernova Hosts." Proceedings of the International Astronomical Union 12, S329 (2016): 49–53. http://dx.doi.org/10.1017/s1743921317002915.

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AbstractWe present a new model of the optical nebular emission from HII regions by combining the results of the Binary Population and Spectral Synthesis (bpass) code with the photoionization code cloudy (Ferland et al. 1998). We explore a variety of emission-line diagnostics of these star-forming HII regions and examine the effects of metallicity and interacting binary evolution on the nebula emission-line production. We compare the line emission properties of HII regions with model stellar populations, and provide new constraints on their stellar populations and supernova progenitors. We find
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Liu, Xiaowei. "Atomic processes in planetary nebulae." Proceedings of the International Astronomical Union 7, S283 (2011): 131–38. http://dx.doi.org/10.1017/s1743921312010836.

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AbstractProgress in the study of the atomic processes in planetary nebulae (PNe) is reviewed, focusing on the literature published since the last IAU symposium on PNe five years ago. High quality photoionization cross sections and recombination coefficients are now available for the first six ions of the trans-iron elements selenium and krypton, enabling robust modeling of their ionization structure and consequently converting the measured ionic abundances to elemental abundances. Major progress has been achieved in utilizing the recombination spectra of helium and heavy element ions to probe
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Bergerud, Brandon M., Steven R. Spangler, and Kara M. Beauchamp. "Realistic models for filling and abundance discrepancy factors in photoionized nebulae." Monthly Notices of the Royal Astronomical Society 492, no. 1 (2019): 1142–53. http://dx.doi.org/10.1093/mnras/stz3515.

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ABSTRACT When comparing nebular electron densities derived from collisionally excited lines (CELs) to those estimated using the emission measure, significant discrepancies are common. The standard solution is to view nebulae as aggregates of dense regions of constant density in an otherwise empty void. This porosity is parametrized by a filling factor f < 1. Similarly, abundance and temperature discrepancies between optical recombination lines (ORLs) and CELs are often explained by invoking a dual delta distribution of a dense, cool, metal-rich component immersed in a diffuse, warm, met
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Oey, M. S., and J. C. Shields. "Calibration of Nebular Emission‐Line Diagnostics. II. Abundances." Astrophysical Journal 539, no. 2 (2000): 687–705. http://dx.doi.org/10.1086/309276.

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Dissertations / Theses on the topic "Nebular diagnostics"

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Dvořáková, Nela. "Spektrální diagnostika látky v okolí ranných hvězd." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-405269.

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Nela Dvořáková 19.7.2019 1 Abstract We study a representative of a diverse group of stars exhibiting the B[e] phe- nomenon, designated MWC 939. This object might be an important link be- tween the stage of the asymptotic giant branch and planetary nebula stage as it is one of a few such objects observed. Our focus is aimed at spectral analysis of the circumstellar matter around the central star. We assemble a line list for MWC 939 and observe variations of its spectrum. Electron density and temper- ature are estimated using nebular diagnostics of ratios of [S II] λλ 6716, 6731 ˚A and [O I] λλ
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Walter, Donald Kim. "The physical diagnostics and ionization structure of the Orion Nebula." Thesis, 1993. http://hdl.handle.net/1911/19086.

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The most detailed study to date of the physical diagnostics and ionization structure of the core of M42 (the Orion Nebula) is presented using new long slit spectra and existing CCD imagery. Cospatial temperature and density diagnostics are presented for distances out to $\sim$5 arcminutes from the Trapezium and clearly show gradients in $T\sb{e}$ and $N\sb{e}.$ Temperatures are derived using S$\sp+,$ O$\sp+,$ N$\sp+,$ O$\sp{++}$ and the Balmer Discontinuity, T(Bac). Values for T(S$\sp+)$ in the range 11,000-14,500 K are presented and suggest shock heating at the ionization front as predicted b
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Jernigan, Tamara Elizabeth. "A plasma diagnostic study of two wind-blown shell nebulae: NGC 7635 and NGC 2359." Thesis, 1989. http://hdl.handle.net/1911/16244.

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We present the first quantitative analysis of the morphology and gaseous-phase properties of two wind-blown shells and their interaction with the interstellar medium by using high spatial resolution emission-line imagery and optical spectrophotometry. We describe the spatially resolved ionization structure and analyze the physical mechanisms responsible for the observed emission by a detailed comparison of emission characteristics with those predicted by both shock-wave and photoionization models. In NGC 7635, our imagery reveals variations in density, temperature, and ionization structure on
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Book chapters on the topic "Nebular diagnostics"

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Díaz, Á. I., and M. Castellanos. "Nebular Diagnostics for Young Stellar Populations: Photon Escape Vs. Atmosphere Blanketing." In Highlights of Spanish Astrophysics III. Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1778-6_48.

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Mendez, Roberto H. "Central Stars of PN: Spectral Diagnostics Based on Model Atmospheres vs. Diagnostics Based on the Classical Nebular Approach." In Stellar Atmospheres: Beyond Classical Models. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3554-2_31.

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Kholtygin, A. F. "PLASMA DIAGNOSTICS OF PLANETARY NEBULAE." In Ambartsumian’s Legacy and Active Universe. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0182-7_1.

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Gutierrez-Moreno, A., H. Moreno, and G. Cortes. "Diagnostic Diagrams for Planetary Nebulae and Symbiotic Stars." In Planetary Nebulae. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2088-3_202.

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Reid, Warren, and Quentin Parker. "Spectral Diagnostics, Kinematics and Abundances Based on a New Population of Planetary Nebulae Discovered in the LMC." In Astrophysics and Space Science Proceedings. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6933-8_87.

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"Nebular Diagnostics." In Physics of the Interstellar and Intergalactic Medium. Princeton University Press, 2010. http://dx.doi.org/10.2307/j.ctvcm4hzr.22.

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"18. Nebular Diagnostics." In Physics of the Interstellar and Intergalactic Medium. Princeton University Press, 2011. http://dx.doi.org/10.1515/9781400839087-019.

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Conference papers on the topic "Nebular diagnostics"

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Rokach, Oleg V. "“DIOGEN” — A New Computing Tool for the Diagnostics and Chemical Analysis of Nebular Plasma." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146233.

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Roth, Martin M. "3D Spectroscopy of Planetary Nebulae — Diagnostic Tools from the Milky Way to Nearby Galaxies and Beyond." In PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP, 2005. http://dx.doi.org/10.1063/1.2146219.

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Sonneborn, George, Rosina C. Iping, James Herald, et al. "Far-UV Temperature Diagnostics for Hot Central Stars of Planetary Nebulae." In FUTURE DIRECTIONS IN ULTRAVIOLET SPECTROSCOPY: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission. AIP, 2009. http://dx.doi.org/10.1063/1.3154045.

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DEL ZANNA, L., D. VOLPI, E. AMATO, and N. BUCCIANTINI. "RELATIVISTIC MHD SIMULATIONS AND SYNTHETIC SYNCHROTRON EMISSION MAPS: A DIAGNOSTIC TOOL FOR PULSAR WIND NEBULAE." In Proceedings of the MG11 Meeting on General Relativity. World Scientific Publishing Company, 2008. http://dx.doi.org/10.1142/9789812834300_0194.

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