期刊
ASTRONOMY & ASTROPHYSICS
卷 474, 期 1, 页码 205-211出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20077316
关键词
binaries : close; stars : late-type; white dwarfs; novae; cataclysmic variables
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 similar to 7500 K) DA white dwarf as the primary and an M5.5 +/- 1 main-sequence star as the secondary component. The current orbital period is P-orb = 3.54(07) h. We derive a mass ratio M-sec/M-wd = 0.36(03) and estimate the distance to d = 25-40 pc. Long-term variation of the orbital light curve and an additional H alpha emission component on the white dwarf indicate activity in the system, probably in the form of flaring and/or accretion events.
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