Mukadam, Anjum S., Szkody, Paula, Gaensicke, B. T. (Boris T.) and Nitta, Atsuko. (2009) Singing and dancing white dwarfs. Journal of Physics: Conference Series, Vol.172 (No.1). 012069. ISSN 1742-6596

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Abstract

Accreting white dwarfs have recently been shown to exhibit non-radial pulsations similar to their non-interacting counterparts. This allows us to probe the interior of the accreting white dwarf using seismology, and may be the only way to determine masses for non-eclipsing cataclysmic variables. Improving our understanding of accreting white dwarfs will have implications for models of supernovae Type Ia. Pulsating white dwarfs in cataclysmic variables are also useful in establishing the effects of accretion on pulsations.

A search for nonradial pulsations among suitable candidates has led to the discovery of twelve such systems known to date. With the goal of establishing an instability strip (or strips) for these pulsating accretors, we acquired HST ultra-violet time-series spectroscopy of six pulsating white dwarfs in cataclysmic variables in 2007 and 2008. This approach enables us to measure the effective temperature of the white dwarf using the co-added spectrum, and to simultaneously characterize the pulsations. We also intended to constrain the pulsation mode identification by comparing the ultra-violet amplitudes to those from near-simultaneous ground-based photometry. Our preliminary results indicate a broad instability strip in the temperature range of 10500–15400 K.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	White dwarf stars, Cataclysmic variable stars, Pulsating stars
Journal or Publication Title:	Journal of Physics: Conference Series
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	1742-6596
Official Date:	2009
Dates:	Date Event 2009 UNSPECIFIED
Volume:	Vol.172
Number:	No.1
Page Range:	012069
Identification Number:	10.1088/1742-6596/172/1/012069
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	National Science Foundation (U.S.) (NSF), Space Telescope Science Institute (U.S.) (STScI)
Grant number:	AST-0607840 (NSF), HST GO-10233.01-A (STScI), HST GO-11163.01-A (STScI)
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URI:	http://wrap.warwick.ac.uk/id/eprint/40193

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