Trace hydrogen in DB white dwarfs: GD408 - The lowest H abundance case

Details Trace hydrogen in DB white dwarfs: GD408 - The lowest H abundance case Trace hydrogen in DB white dwarfs: GD408 - The lowest H abundance case

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..389w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 389-391.

Astronomy and Astrophysics

Astrophysics

10

H Alpha Line, Hydrogen Atoms, Spectroscopic Analysis, Stellar Atmospheres, White Dwarf Stars, Absorption Spectra, Abundance, Balmer Series, Line Spectra

Scientific paper

Improved IUE observations revealed the presence of trace hydrogen in the helium atmosphere of GD408, a DB star at Teff of 13,500 K. The hydrogen abundance determined by spectroscopic analysis, log H/He = -6, is considerably smaller than the value determined for other DB stars, which are classified DBA due to the presence of visible hydrogen lines. A faint H-alpha absorption line, barely detected, is consistent with the abundances derived. The DBA stars thus probably do not constitute a separate subclass with a well-defined hydrogen trace abundance, but display a rather wide range of H abundances, limited only by the observational capabilities.

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