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

H. Edelmann; U. Heber; R. Napiwotzki

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 language	English
Title of host publication	In: Procs of the 12th European Workshop on White Dwarf Stars, ASP Conference Proceedings 226
Publisher	Astronomical Society of the Pacific
Pages	143-6
ISBN (Print)	1-58381-058-7
Publication status	Published - 2001

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title = "Spectral Monitoring of HS 0209+0832 a DAB White Dwarf in the DB Gap",

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.",

author = "H. Edelmann and U. Heber and R. Napiwotzki",

note = "Original paper can be found at: http://www.astrosociety.org/pubs/cs/222-252.html--Copyright Astronomical Society of the Pacific",

year = "2001",

language = "English",

isbn = "1-58381-058-7",

pages = "143--6",

booktitle = "In: Procs of the 12th European Workshop on White Dwarf Stars, ASP Conference Proceedings 226",

publisher = "Astronomical Society of the Pacific",

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TY - GEN

T1 - Spectral Monitoring of HS 0209+0832 a DAB White Dwarf in the DB Gap

AU - Edelmann, H.

AU - Heber, U.

AU - Napiwotzki, R.

N1 - Original paper can be found at: http://www.astrosociety.org/pubs/cs/222-252.html--Copyright Astronomical Society of the Pacific

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

M3 - Conference contribution

SN - 1-58381-058-7

SP - 143

EP - 146

BT - In: Procs of the 12th European Workshop on White Dwarf Stars, ASP Conference Proceedings 226

PB - Astronomical Society of the Pacific

ER -

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

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