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Orbital periods of cataclysmic variables identified by the SDSS. VI, The 4.5-h period eclipsing system SDSS J100658.40+233724.4

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Southworth, J. (John), Hickman, R. D. G. (Richard D. G.), Marsh, T. R., Rebassa-Mansergas, A., Gänsicke, B. T. (Boris T.), Copperwheat, C. M. and Rodríguez-Gil, P.. (2009) Orbital periods of cataclysmic variables identified by the SDSS. VI, The 4.5-h period eclipsing system SDSS J100658.40+233724.4. Astronomy & Astrophysics, Vol.507 (No.2). pp. 929-937. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/200912885

Abstract

We present time-resolved spectroscopy and photometry of SDSS J100658.40+233724.4, which we have discovered to be an eclipsing cataclysmic variable with an orbital period of 0.18591324 days (267.71507 min). The observed velocity amplitude of the secondary star is 276 ± 7 kms−1, which an irradiation correction reduces to 258 ± 12 km s−1. Doppler tomography of emission lines from the infrared calcium triplet supports this measurement. We have modelled the light curve using the lcurve code and Markov Chain Monte Carlo simulations, finding a mass ratio of 0.51 ± 0.08. From the velocity amplitude and the light curve analysis we find the mass of the white dwarf to be 0.78±0.12 M and the masses and radii of the secondary star to be 0.40±0.10 M and 0.466±0.036 R,respectively. The secondary component is less dense than a normal main sequence star but its properties are in good agreement with the expected values for a CV of this orbital period. By modelling the spectral energy distribution of the system we find a distance of 676 ± 40 pc and estimate a white dwarf effective temperature of 16 500 ± 2000 K.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Cataclysmic variable stars, Eclipsing binaries, Double stars -- Orbits, Double stars -- Masses
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	November 2009
Volume:	Vol.507
Number:	No.2
Number of Pages:	9
Page Range:	pp. 929-937
Identification Number:	10.1051/0004-6361/200912885
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Science and Technology Facilities Council (Great Britain) (STFC), European Southern Observatory (ESO), Chile. Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)
Grant number:	ST/F002599/1 (STFC), 32080023 (ESO & CONICYT)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3424