Period-Luminosity Relations for Ellipsoidal Binary Stars in the OGLE-III Fields of the Large Magellanic Cloud
Period-Luminosity Relations for Ellipsoidal Binary Stars in the OGLE-III Fields of the Large Magellanic Cloud
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2014-12
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通讯作者：
M. Pawlak;I. Soszyński;P. Pietrukowicz;J. Skowron;R. Poleski;A. Udalski;M. Szymański;M. Kubiak;G. Pietrzyński;L. Wyrzykowski;K. Ulaczyk;S. Kozłowski;D. Skowron
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作者：
M. Pawlak;I. Soszyński;P. Pietrukowicz;J. Skowron;R. Poleski;A. Udalski;M. Szymański;M. Kubiak;G. Pietrzyński;L. Wyrzykowski;K. Ulaczyk;S. Kozłowski;D. Skowron
我们报告在周期-光度（P-L）图上发现了两种不同类型的椭球双星系统，即所谓的序列E。我们提出陡峭的P-L关系由巨-矮双星组成，而另一个由巨-巨双星系统组成。分析是基于5334个天体的样本，这些天体是我们从OGLE-III对大麦哲伦星云的调查数据中选择的。我们发现椭球双星的一个组成部分通常是红团星或红巨星分支星，这导致序列E在P = 40 d时明显分离分裂。在其短周期部分，我们确定了两个子序列对应于两种类型的双星系统（E2和E3），而在较长周期部分，两个组合并形成单个子序列E1。我们从样本中提取了271个偏心轨道椭球系统。我们给出了它们遵循的周期-光度关系。
We report the discovery of two distinct types of ellipsoidal binary systems occupying, so called, sequence E on the period-luminosity (P-L) diagram. We propose that steeper P-L relation is composed of giant-dwarf binaries, while the other consists of giant-giant binary systems. Analysis is based on a sample of 5334 objects, which we select from the OGLE-III survey data toward the the Large Magellanic Cloud. We show that one of the components of ellipsoidal binaries is typically either a Red Clump or a Red Giant Branch star, which leads to clear separation split of the sequence E at P = 40 d. In its short-period part, we identify two subsequences corresponding to the two types of binary systems (E2 and E3), while in the longer-period part the two groups merge forming a single subsequence E1. We extract a group of 271 ellipsoidal systems with eccentric orbits, from our sample. We present the period-luminosity relation they follow.