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Detection of trace helium in G104 - 27, a 26,000 K DA white dwarfThe detection of the He I 4471 A feature in the moderately hot DA white dwarf G104 - 27 places this star within the rather sparse class of DAB white dwarfs. It does not appear possible, on the basis of the present data, to distinguish between a stratified and a homogeneously mixed atmosphere. While a stratified structure would be natural for a DA white dwarf, G104 - 27 resides near the red edge of the DB gap, in a region where DA stars could transform into DB stars through convective mixing in the underlying He envelope and thereby destroy envelope stratification. Both atmospheres are consistent with the existing soft X-ray flux limit for this star.
Document ID
19910033898
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Holberg, J. B.
(Arizona Univ. Tucson, AZ, United States)
Kidder, K. M.
(Arizona, University Tucson, United States)
Wesemael, F.
(Montreal, Universite Montreal, Canada)
Date Acquired
August 15, 2013
Publication Date
December 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 365
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A18521
Funding Number(s)
CONTRACT_GRANT: NAG5-434
Distribution Limits
Public
Copyright
Other

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