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

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Author
Edelmann, H.
Heber, U.
Napiwotzki, R.
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.
Publication date
2001
Published in
In: Procs of the 12th European Workshop on White Dwarf Stars, ASP Conference Proceedings 226
Other links
http://hdl.handle.net/2299/1424
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