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Orbital periods of cataclysmic variables identified by the SDSS. VII, Four new eclipsing systems

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Southworth, J. (John), Copperwheat, C. M., Gänsicke, B. T. (Boris T.) and Pyrzas, S.. (2010) Orbital periods of cataclysmic variables identified by the SDSS. VII, Four new eclipsing systems. Astronomy & Astrophysics, Vol.510 (No.A100). ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/200913576

Abstract

We present photometry of nine cataclysmic variable stars identified by the Sloan Digital Sky Survey, aimed at measuring the orbital periods of these systems. Four of these objects show deep eclipses, from which we measure their orbital periods. The light curves of three of the eclipsing systems are also analysed using the lcurve code, and their mass ratios and orbital inclinations determined. SDSS J075059.97+141150.1 has an orbital period of 134.1564 ± 0.0008 min, making it a useful object with which to investigate the evolutionary processes of cataclysmic variables. SDSS J092444.48+080150.9 has a period of 131.2432 ± 0.0014 min and is probably magnetic. The white dwarf ingress and egress phases are very deep and short, and there is no clear evidence that this object has an accretion disc. SDSS J115207.00+404947.8 and SDSS J152419.33+220920.1 are nearly identical twins, with periods of 97.5 ± 0.4 and 93.6 ± 0.5 min and mass ratios of 0.14 ± 0.03 and 0.17 ± 0.03, respectively. Their eclipses have well-defined white dwarf and bright spot ingress and egress features, making them excellent candidates for detailed study. All four of the orbital periods presented here are shorter than the 2–3 h period gap observed in the known population of cataclysmic variables.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Cataclysmic variable stars, Stars -- Orbits, Eclipsing binaries
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	February 2010
Volume:	Vol.510
Number:	No.A100
Number of Pages:	9
Identification Number:	10.1051/0004-6361/200913576
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Science and Technology Facilities Council (Great Britain) (STFC)
Grant number:	ST/F002599/1 (STFC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3421