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

Edelmann, H., Heber, U. and Napiwotzki, R. (2001) Spectral Monitoring of HS 0209+0832 a DAB White Dwarf in the DB Gap. In: In: Procs of the 12th European Workshop on White Dwarf Stars, ASP Conference Proceedings 226 :. Astronomical Society of the Pacific, pp. 143-6. ISBN 1-58381-058-7

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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.

Item Type	Book Section
Additional information	Original paper can be found at: http://www.astrosociety.org/pubs/cs/222-252.html--Copyright Astronomical Society of the Pacific
Date Deposited	15 May 2025 16:18
Last Modified	30 May 2025 23:08

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