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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Bibliographic Details
Published in:The Astrophysical journal Vol. 355; no. 1; pp. 255 - 270
Main Authors: Schmutz, W., Abbott, D. C., Russell, R. S., Hamann, W.-R., Wessolowski, U.
Format: Journal Article
Language:English
Published: Legacy CDMS University of Chicago Press 20.05.1990
Subjects:
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
Stellar atmosphere
Atmosphere model
Blanketing
Digital simulation
Non LTE
Ultraviolet spectrum
Hydrodynamic model
Spectral line formation
Velocity distribution
Density distribution
Extragalactic supernova
ISSN:0004-637X, 1538-4357
Online Access:Get full text
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Description
Summary: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.
Bibliography:CDMS
Legacy CDMS
ISSN: 0004-637X
None
ISSN:0004-637X
1538-4357
DOI:10.1086/168759