The pre-cataclysmic variable, LTT 560

被引：27

作者：

Tappert, C.

Gaensicke, B. T.

Schmidtobreick, L.

Aungwerojwit, A.

Mennickent, R. E.

Koester, D.

机构：

[1] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Macul 7820436, Chile

[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[3] European So Observ, Santiago 19, Chile

[4] Naresuan Univ, Fac Sci, Dept Phys, Phitsanulok 65000, Thailand

[5] Univ Concepcion, Dept Fis, Concepcion, Chile

[6] Univ Kiel, Inst Theoret Phys & Astrophys, D-24098 Kiel, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2007年 / 474卷 / 01期

关键词：

binaries : close; stars : late-type; white dwarfs; novae; cataclysmic variables;

D O I：

10.1051/0004-6361:20077316

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：205 / 211

页数：7

共 57 条

[1] An alternative to common envelope evolution [J].