Analysis of ultraviolet and extreme-ultraviolet spectra of the DA white dwarf G 191-B2B using self-consistent diffusion models

Details Analysis of ultraviolet and extreme-ultraviolet spectra of the DA white dwarf G 191-B2B using self-consistent diffusion models Analysis of ultraviolet and extreme-ultraviolet spectra of the DA white dwarf G 191-B2B using self-consistent diffusion models

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...348..189d&link_type=abstract

Astronomy and Astrophysics, v.348, p.189-197 (1999)

Astronomy and Astrophysics

Astrophysics

36

Stars: Abundances, Stars: Atmospheres, Stars: Evolution, Stars: Individual: G 191-B2B, Stars: White Dwarfs, Ultraviolet: Stars

Scientific paper

We present a multi-wavelength spectral analysis of the DA white dwarf G 191-B2B. The employed atmospheric models account for gravitational settling and radiative levitation, which are, for the first time, calculated self-consistently with the atmospheric structure. The resulting spectra can reproduce the complete EUVE spectrum and the ultraviolet lines of iron. Some restrictions regarding the UV lines of other elements (C, N, O, Ni), however, still remain. In contrast to homogeneous models, it is not necessary to introduce additional photospheric or interstellar absorbers to account for the high opacity at lambda <~ 230 Ä. Abundance profile changing mechanisms, like mass-loss or accretion, are also not needed. Based on observations made with the EUVE Sattelite and with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555.

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