EREBOS项目-调查亚恒星和低质量恒星伴星对后期恒星演化的影响
The EREBOS project -- Investigating the effect of substellar and low-mass stellar companions on late stellar evolution
摘要：
后共包络双星的发现对于解决知之甚少、寿命很短的共包络阶段非常重要。大多数热的次矮星（sdO/Bs）是红巨星燃烧氦的核心，它们几乎失去了所有的氢包层。这种质量损失通常是由与近距离恒星甚至亚恒星伴星的常见包层相互作用引发的。在最近出版的银河系膨胀和ATLAS调查中的食双星目录中，我们发现了161个新的食系统，通过对光曲线的目视检查和使用机器学习算法显示出反射效应。EREBOS（从光学巡天中捕获反射效应双星）项目旨在分析所有新发现的具有反射效应的食双星，并基于光谱和光度跟踪。为了限制主星的性质，我们在盖亚任务测量的恒星松弛和自行的帮助下，推导出了所有目标的绝对星等和约化自行，并将其与盖亚白矮星目录进行了比较。对于我们观测到的光谱的一个子集的目标，性质可以通过测量大气参数的主要确认，不到10%的我们的系统是不是sdO/Bs与冷的同伴，但白矮星或中心恒星的行星状星云。这个大样本的蚀热亚矮星与冷同伴使我们能够获得一个显着的周期分布的热亚矮星与冷同伴的第一次表明，周期分布比以前认为的要广泛得多，非常适合寻找最低质量的同伴热亚矮星。未来将进行几次新的光度测量，这将增加该项目的样本，从而有可能测试共同包络理论和双星演化的许多方面。
英文摘要：
Eclipsing post-common envelope binaries are highly important for resolving the poorly understood, very short-lived common envelope phase. Most hot subdwarfs (sdO/Bs) are the bare He-burning cores of red giants which have lost almost all of their hydrogen envelopes. This mass loss is often triggered by common envelope interactions with close stellar or even sub-stellar companions. In the recently published catalog of eclipsing binaries in the Galactic Bulge and in the ATLAS survey, we discovered 161 new eclipsing systems showing a reflection effect by visual inspection of the light curves and using a machine-learning algorithm. The EREBOS (Eclipsing Reflection Effect Binaries from Optical Surveys) project aims at analyzing all newly discovered eclipsing binaries with reflection effect based on a spectroscopic and photometric follow up. To constrain the nature of the primary we derived the absolute magnitude and the reduced proper motion of all our targets with the help of the parallaxes and proper motions measured by the Gaia mission and compared those to the Gaia white dwarf catalogue. For a sub-set of our targets with observed spectra the nature could be derived by measuring the atmospheric parameter of the primary confirming that less than 10\% of our systems are not sdO/Bs with cool companions but white dwarfs or central stars of planetary nebula. This large sample of eclipsing hot subdwarfs with cool companions allowed us to derive a significant period distribution for hot subdwarfs with cool companions for the first time showing that the period distribution is much broader than previously thought and ideally suited to find the lowest mass companions to hot subdwarf stars. In the future several new photometric surveys will be carried out, which will increase the sample of this project even more giving the potential to test many aspects of common envelope theory and binary evolution.
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