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The pre-cataclysmic variable, LTT 560 \ud

By Claus Tappert, B. T. Gaensicke, Linda Schmidtobreick, A. Aungwerojwit, Ronald E. Mennickent and Detlev Koester


Aims. System parameters of the object LTT560 are determined in order to clarify its nature and evolutionary status.\ud 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.\ud 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\ud on the white dwarf indicate activity in the system, probably in the form of flaring and/or accretion events

Topics: QB
Publisher: EDP Sciences
Year: 2007
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  1. (2007). A&A, in press, [arXiv:0707.0501]

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