Iron abundance in the hot DA white dwarfs Feige 24 and G191 B2B

Details Iron abundance in the hot DA white dwarfs Feige 24 and G191 B2B Iron abundance in the hot DA white dwarfs Feige 24 and G191 B2B

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392l..27v&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. L27-L30. Research supported by NSF.

Astronomy and Astrophysics

Astrophysics

52

Iue, Metallicity, Stellar Atmospheres, Stellar Spectrophotometry, Ultraviolet Spectra, White Dwarf Stars, Abundance, Iron, Stellar Composition

Scientific paper

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.

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