Detection of trace helium in G104 - 27, a 26,000 K DA white dwarf

Details Detection of trace helium in G104 - 27, a 26,000 K DA white dwarf Detection of trace helium in G104 - 27, a 26,000 K DA white dwarf

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365l..77h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. L77-L80. Research supported by NSERC and M

Astronomy and Astrophysics

Astrophysics

19

Helium, Stellar Composition, Trace Elements, White Dwarf Stars, Helium Ions, Stellar Atmospheres, Stellar Envelopes, Stellar Spectra, Ultraviolet Spectra

Scientific paper

The 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.

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