Line Blanketed Model Atmospheres for Metal-rich White Dwarfs

Details Line Blanketed Model Atmospheres for Metal-rich White Dwarfs Line Blanketed Model Atmospheres for Metal-rich White Dwarfs

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5004l&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #50.04; Bulletin of the American Astronomical Society, Vol. 24, p.1203

Astronomy and Astrophysics

Astronomy

2

Scientific paper

In many cases of a close binary system composed of a white dwarf, a companion main-sequence or giant star, and an accretion disk around the white dwarf, the UV spectrum of the system contains contributions from both the white dwarf and the disk. In order to derive information about the system from its UV spectrum, the white dwarf atmosphere has to be accurately modeled. The chemical composition of the white dwarf is very likely to be quite unusual, however, because it may have nearly solar composition due to accretion. Due to its high surface gravity, the white dwarf's lines are generally very broad, and thus metal line blanketing may play a very important role. We have therefore begun a project of calculating a grid of non-LTE, fully line-blanketed model atmospheres for white dwarfs, for a large range of metal abundances, from zero (pure DA) to solar composition. The method is described in a companion paper (Hubeny and Lanz) at this meeting. We consider a representative model atmosphere with T_eff=15000 K and log g = 8. In this preliminary study, only hydrogen and iron (Fe II and Fe III) opacity was considered. The models take into account 45815 Fe II and 23059 Fe III lines (all lines between the levels with measured energies). As expected, the NLTE effects are rather small for this temperature, but the effect of metal line blanketing is very important. In particular, we demonstrate how the metal line blanketing influences the UV spectrum and the hydrogen Lyman and Balmer lines profiles. The work on the project was supported in part by the NASA grant No.65 under program NRA 91-OSSA-12.

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