NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
iron abundance in the hot da white dwarfs feige 24 and g191 b2bAttention 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.
Document ID
19920059822
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Vennes, Stephane
(California, University Berkeley, United States)
Chayer, Pierre
(Montreal, Universite Montreal, Canada)
Thorstensen, John R.
(Dartmouth College Hanover, NH, United States)
Bowyer, Stuart
(California, University Berkeley, United States)
Shipman, Harry L.
(Delaware, University Newark, United States)
Date Acquired
August 15, 2013
Publication Date
June 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 392
Issue: 1 Ju
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-972
CONTRACT_GRANT: NAG5-1654
CONTRACT_GRANT: NAG5-1805
CONTRACT_GRANT: NAS5-30180
CONTRACT_GRANT: NAG5-1409
Distribution Limits
Public
Copyright
Other