Spectral Monitoring of HS 0209+0832 a DAB White Dwarf in the DB Gap

H. Edelmann, U. Heber, R. Napiwotzki

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Abstract

We report results of a spectral monitoring campagne of the DAB white dwarf HS 0209+0832, for which helium line profile variations were reported earlier (Heber et al. 1997). This finding is confirmed by our discovery of a second epoch (October 1997) of unusually low helium line strength and of their subsequent recovery. The observed changes in line strength correspond to a variation of the (average) helium abundance by a factor of 2.
Original languageEnglish
Title of host publicationIn: Procs of the 12th European Workshop on White Dwarf Stars, ASP Conference Proceedings 226
PublisherAstronomical Society of the Pacific
Pages143-6
ISBN (Print)1-58381-058-7
Publication statusPublished - 2001

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