Mukadam, Anjum S., Gänsicke, B. T. (Boris T.), Szkody, P., Aungwerojwit, A. (Amornrat), Howell, Steve B., Fraser, O. J. and Silvestri, N. M.. (2007) Discovery of two new accreting pulsating white dwarf stars. Astrophysical Journal, Vol.667 (No.1). pp. 433-441. ISSN 0004-637X

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Abstract

We report the discovery of two new accreting pulsating white dwarf stars among the cataclysmic variables of the Sloan Digital Sky Survey: SDSS J074531.91+453829.5 and SDSS J091945.10+085710.0. We observe high-amplitude nonsinusoidal variations of 4.5%-7% at a period close to 1230 s in the optical light curves of SDSS J074531.91+453829.5 and a low-amplitude variation of 0.7%-1.6% near 260 s in the light curves of SDSS J091945.10+085710.0. We infer that these optical variations are a consequence of nonradial g-mode pulsations in the accreting primary white dwarfs of these cataclysmic variables. However, we cannot rule out the remote possibility that the 260 s period could be the spin period of the accreting white dwarf SDSS J091945.10+085710.0. We also uncovered a nonvariable, SDSS J171145.08+301320.0, during our search; our two observing runs exclude any pulsation-related periodicities in the range 85-1400 s with an amplitude >= 0.5%. This discovery paper brings the total number of known accreting white dwarf pulsators to 11.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Astrophysical Journal
Publisher:	IOP Publishing
ISSN:	0004-637X
Date:	20 September 2007
Volume:	Vol.667
Number:	No.1
Number of Pages:	9
Page Range:	pp. 433-441
Identification Number:	10.1086/520700
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/31383

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