DEEP, LOW MASS RATIO OVERCONTACT BINARY SYSTEMS. XIV. A STATISTICAL ANALYSIS OF 46 SAMPLE BINARIES
DEEP, LOW MASS RATIO OVERCONTACT BINARY SYSTEMS. XIV. A STATISTICAL ANALYSIS OF 46 SAMPLE BINARIES
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DOI：
10.1088/0004-6256/150/3/69
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发表时间：
2015-08
期刊：
影响因子：
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通讯作者：
Yuangui Yang;S. Qian
中科院分区：
文献类型：
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作者：
Yuangui Yang;S. Qian
46个深，低质量比（DLMR）过接触双星（即，q ≤ 0.25？>且f ≥ 50%？>）进行了统计分析。发现某些物理参数之间可能存在五种关系。主要的组成部分是位于零年龄主序星和末龄主序星（TAMS）之间的演化程度很低的主序星。同时，次级成分可能是TAMS线以上的演化恒星。超光度和大半径可能是由于能量转移导致它们的体积膨胀。确定了各组分的M-L和M-R方程。P-Mtotal的关系意味着当轨道周期减小时，质量可能从中心系统逃逸。最小质量比可以初步为q min = 0.044（± 0.007）？从q-f和q-Jspin/Jorb的关系出发，随着质量和角动量的损失，轨道周期减小，最终导致这类DLMR过接触双星合并为快速旋转的单颗星星。
A sample of 46 deep, low mass ratio (DLMR) overcontact binaries (i.e., q ≤ 0.25 ?> and f ≥ 50 % ?> ) is statistically analyzed in this paper. It is found that five relations possibly exist among some physical parameters. The primary components are little-evolved main sequence stars that lie between the zero-age main sequence line and the terminal-age main sequence (TAMS) line. Meanwhile, the secondary components may be evolved stars above the TAMS line. The super-luminosities and large radii may result from energy transfer, which causes their volumes to expand. The equations of M–L and M–R for the components are also determined. The relation of P–Mtotal implies that mass may escape from the central system when the orbital period decreases. The minimum mass ratio may preliminarily be q min = 0.044 ( ± 0.007 ) ?> from the relations of q–f and q–Jspin/Jorb. With mass and angular momentum loss, the orbital period decreases, which finally causes this kind of DLMR overcontact binary to merge into a rapid-rotating single star.