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arXiv 0908.3900astro-ph.SR
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一类相互作用双星双周期变星

The class of interacting binaries Double Periodic Variables

R. E. Mennickent, Z. Kolaczkowski

摘要:

我们介绍了一类名为双周期变星(DPVs)的中等质量双星,其特征是轨道光度变化(椭球或日食)的时间尺度为几天和一个长的光度周期持续约33倍的轨道周期。在OGLE和ASAS目录中进行搜索后,我们在麦哲伦星云中确定了114个这样的系统,在银河系中确定了11个。我们提出的结果,我们的光度和光谱运动在过去几年中进行的DPVs,概述了他们的主要观测特征。我们提出了令人信服的证据支持这样的观点,DPVs是半独立的相互作用的双星与光学厚光盘周围的收益者,经验到星际介质的质量损失的定期周期。调节这一长期过程的机制仍然是未知的,但可能是有关的松弛周期的circumprimary光盘。一个关键的观测事实是HeI 5875的半高宽与V393 Sco的长周期的调制。DPV的演化阶段的研究以及它们的关系,Algols和W Serpentid星。我们的结论是,DPVs可以用来测试模型的非保守的二进制演化,包括形成的circumbinary光盘。

英文摘要:

We introduce the class of intermediate mass binaries named Double Periodic Variables (DPVs), characterized by orbital photometric variability (ellipsoidal or eclipsing) in time scales of few days and a long photometric cycle lasting roughly 33 times the orbital period. After a search conducted in the OGLE and ASAS catalogues, we identified 114 of these systems in the Magellanic Clouds and 11 in the Galaxy. We present results of our photometric and spectroscopic campaigns on DPVs conducted during the last years, outlining their main observational characteristics. We present convincing evidence supporting the view that DPVs are semidetached interacting binaries with optically thick discs around the gainer, that experience regular cycles of mass loss into the interstellar medium. The mechanism regulating this long-term process still is unknown but probably is related to relaxation cycles of the circumprimary disc. A key observational fact is the modulation of the FWHM of HeI 5875 with the long cycle in V393 Sco. The DPV evolution stage is investigated along with their relationship to Algols and W Serpentid stars. We conclude that DPVs can be used to test models of non-conservative binary evolution including the formation of circumbinary discs.

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