Non-LTE model calculations for SN 1987A and the extragalactic distance scale
This paper presents model atmospheres for the first week of SN 1987A, based on the luminosity and density/velocity structure from hydrodynamic models of Woosley (1988). The models account for line blanketing, expansion, sphericity, and departures from LTE in hydrogen and helium and differ from previ...
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| Veröffentlicht in: | The Astrophysical journal Jg. 355; H. 1; S. 255 - 270 |
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| Hauptverfasser: | , , , , |
| Format: | Journal Article |
| Sprache: | Englisch |
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Legacy CDMS
University of Chicago Press
20.05.1990
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| ISSN: | 0004-637X, 1538-4357 |
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| Abstract | This paper presents model atmospheres for the first week of SN 1987A, based on the luminosity and density/velocity structure from hydrodynamic models of Woosley (1988). The models account for line blanketing, expansion, sphericity, and departures from LTE in hydrogen and helium and differ from previously published efforts because they represent ab initio calculations, i.e., they contain essentially no free parameters. The formation of the UV spectrum is dominated by the effects of line blanketing. In the absorption troughs, the Balmer line profiles were fit well by these models, but the observed emissions are significantly stronger than predicted, perhaps due to clumping. The generally good agreement between the present synthetic spectra and observations provides independent support for the overall accuracy of the hydrodynamic models of Woosley. The question of the accuracy of the Baade-Wesselink method is addressed in a detailed discussion of its approximations. While the application of the standard method produces a distance within an uncertainty of 20 percent in the case of SN 1987A, systematic errors up to a factor of 2 are possible, particularly if the precursor was a red supergiant. |
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| AbstractList | This paper presents model atmospheres for the first week of SN 1987A, based on the luminosity and density/velocity structure from hydrodynamic models of Woosley (1988). The models account for line blanketing, expansion, sphericity, and departures from LTE in hydrogen and helium and differ from previously published efforts because they represent ab initio calculations, i.e., they contain essentially no free parameters. The formation of the UV spectrum is dominated by the effects of line blanketing. In the absorption troughs, the Balmer line profiles were fit well by these models, but the observed emissions are significantly stronger than predicted, perhaps due to clumping. The generally good agreement between the present synthetic spectra and observations provides independent support for the overall accuracy of the hydrodynamic models of Woosley. The question of the accuracy of the Baade-Wesselink method is addressed in a detailed discussion of its approximations. While the application of the standard method produces a distance within an uncertainty of 20 percent in the case of SN 1987A, systematic errors up to a factor of 2 are possible, particularly if the precursor was a red supergiant. This paper presents model atmospheres for the first week of SN 1987A, based on the luminosity and density/velocity structure from hydrodynamic models of Woosley (1988). The models account for line blanketing, expansion, sphericity, and departures from LTE in hydrogen and helium and differ from previously published efforts because they represent ab initio calculations, i.e., they contain essentially no free parameters. The formation of the UV spectrum is dominated by the effects of line blanketing. In the absorption troughs, the Balmer line profiles were fit well by these models, but the observed emissions are significantly stronger than predicted, perhaps due to clumping. The generally good agreement between the present synthetic spectra and observations provides independent support for the overall accuracy of the hydrodynamic models of Woosley. The question of the accuracy of the Baade-Wesselink method is addressed in a detailed discussion of its approximations. While the application of the standard method produces a distance within an uncertainty of 20 percent in the case of SN 1987A, systematic errors up to a factor of 2 are possible, particularly if the precursor was a red supergiant. 68 refs. |
| Audience | PUBLIC |
| Author | Schmutz, W. Hamann, W.-R. Abbott, D. C. Russell, R. S. Wessolowski, U. |
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| Keywords | Stellar atmosphere Atmosphere model Blanketing Digital simulation Non LTE Ultraviolet spectrum Hydrodynamic model Spectral line formation Velocity distribution Density distribution Extragalactic supernova |
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| SubjectTerms | Astronomy Astrophysics ATMOSPHERES BALMER LINES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Earth, ocean, space ELEMENTS EQUILIBRIUM ERUPTIVE VARIABLE STARS Exact sciences and technology EXPANSION FLUID MECHANICS FLUIDS GALAXIES GASES GIANT STARS HELIUM HYDRODYNAMICS HYDROGEN Late stages of stellar evolution (including black holes) LTE LUMINOSITY MAGELLANIC CLOUDS MATHEMATICAL MODELS MECHANICS NONMETALS OPTICAL PROPERTIES PHYSICAL PROPERTIES RARE GASES SPECTRA STAR MODELS STARS STELLAR ATMOSPHERES SUPERGIANT STARS SUPERNOVAE ULTRAVIOLET SPECTRA VARIABLE STARS 640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar, Radio & X-Ray Sources |
| Title | Non-LTE model calculations for SN 1987A and the extragalactic distance scale |
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