Tappert, Claus, Gänsicke, B. T. (Boris T.), Schmidtobreick, Linda, Aungwerojwit, A. (Amornrat), Mennickent, Ronald E. and Koester, Detlev, 1941-. (2007) The pre-cataclysmic variable, LTT 560. Astronomy & Astrophysics, Vol.474 (No.1). pp. 205-211. ISSN 0004-6361

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Abstract

Aims. System parameters of the object LTT560 are determined in order to clarify its nature and evolutionary status. Methods. We apply time-series photometry to reveal orbital modulations of the light curve, time-series spectroscopy to measure radial velocities of features from both the primary and the secondary star, and flux-calibrated spectroscopy to derive temperatures of both components. Results. We find that LTT 560 is composed of a low temperature (T ∼ 7500 K) DA white dwarf as the primary and an M5.5±1 mainsequence star as the secondary component. The current orbital period is Porb = 3.54(07) h.We derive a mass ratio Msec/Mwd = 0.36(03) and estimate the distance to d = 25–40 pc. Long-term variation of the orbital light curve and an additional Hα emission component on the white dwarf indicate activity in the system, probably in the form of flaring and/or accretion events.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Cataclysmic variable stars, Double stars -- Orbits, Double stars -- Motion in line of sight, Stars -- Temperature, Stars -- Observations
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	October 2007
Volume:	Vol.474
Number:	No.1
Page Range:	pp. 205-211
Identification Number:	10.1051/0004-6361:20077316
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Thailand
Grant number:	1051078 (FONDECYT)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3459

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