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arXiv 0709.4373astro-ph
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大灾变前变量LTT560

The pre-cataclysmic variable, LTT560

C. Tappert, B. T. Gaensicke, L. Schmidtobreick, A. Aungwerojwit, R. E. Mennickent, D. Koester

摘要:

确定对象LTT 560的系统参数,以澄清其性质和演化状态。我们应用时间序列测光揭示轨道调制的光变曲线,时间序列光谱测量径向速度的功能,从主星和次星,和通量校准光谱,以获得这两个组件的温度。我们发现LTT 560是由一颗T~ 7500 K的低温DA白矮星作为主星和一颗M5.5+-1主序星作为次级组成。目前的轨道周期是Porb=3.54(07)h。我们导出了质量比Msec/Mwd = 0.36(03),并估计了d=25- 40 pc的距离。轨道光变曲线的长期变化和白矮星上额外的H-α发射分量表明系统中的活动,可能是以耀斑和/或吸积事件的形式。

英文摘要:

System parameters of the object LTT560 are determined in order to clarify its nature and evolutionary status. 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. We find that LTT560 is composed of a low temperature T~7500K DA white dwarf as the primary and an M5.5+-1 main-sequence 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=25-40pc. 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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