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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., Gaensicke, 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

Official Date:

November 2009

Dates:

Date	Event
November 2009	Published

Volume:

Vol.507

Number:

No.2

Number of Pages:

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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