Iron Abundance in the Hot DA White Dwarfs Feige 24 and G191 B2B
Abstract
Attention is given to model calculations of the far- and extreme-UV line spectra of highly ionized Fe species (Fe IV, Fe V, and Fe VI) for hot high-gravity H-rich stars. A spectral analysis of 31 hr of exposure of the DA white dwarf Feige 24 with IUE in the echelle mode reveals the presence of Fe with an abundance relative to H by number of (5-10) x 10 exp -6 with an uncertainty dominated by the determination of stellar parameters. An analysis of IUE data from the white dwarf G191 B2B results in a similar Fe abundance if this star shares similar atmospheric parameters (Teff, g) with Feige 24. Fe is thus the second most abundant photospheric element in hot DA white dwarfs.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1992
- DOI:
- 10.1086/186417
- Bibcode:
- 1992ApJ...392L..27V
- Keywords:
-
- Iue;
- Metallicity;
- Stellar Atmospheres;
- Stellar Spectrophotometry;
- Ultraviolet Spectra;
- White Dwarf Stars;
- Abundance;
- Iron;
- Stellar Composition;
- Astrophysics;
- STARS: WHITE DWARFS;
- STARS: ATMOSPHERES;
- STARS: ABUNDANCES;
- ULTRAVIOLET: STARS