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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Comprehensive photometric study of an extremely low mass ratio deep contact binary in the globular cluster M4
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Comprehensive photometric study of an extremely low mass ratio deep contact binary in the globular cluster M4

机译：全面的光度研究在球状簇中极低质量比深度接触二元的综合测光研究

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摘要

A comprehensive photometric study and an investigation of the orbital period variation of V53 in the globular cluster M4 are presented. The photometric study reveals that the mass ratio and the contact degree of V53 are q similar to 0.078 and f similar to 69%, respectively. The observed variation in the light curve can be explained by adjusting the spot parameters. V53 belongs to extreme mass ratio (q <= 0.25), deep contact (f >= 50%) binaries, and its mass ratio is close to the minimum mass ratio predicted by theoretical studies, making it a potential object for studying the evolution of binaries and the formation of blue stragglers and FK Com-type stars. The orbital period of V53 shows a long-term decrease at a rate of dp/dt = 5.89(+/- 0.02) x 10(-8) dyr(-1). This secular period decrease may be caused by the combination of mass transfer from the more massive component to the less massive component and an angular momentum loss via magnetic braking. As this mass transfer and angular momentum loss continues, V53 will ultimately evolve into a single fast-rotation star. By studying the statistics of all the contact binaries in globular clusters that have been analyzed, we found a possible correlation between the contact degree and whether or not a contact binary is a blue straggler. A contact binary is likely to become a blue straggler when its fill-out factor is more than 46.25(+/- 2.05)%. More samples should be introduced to confirm this preliminary result in the future.
机译：介绍了全面的光度研究和对球状簇M4中V53的轨道周期变异的研究。光度研究表明，质量比和V53的接触程度为Q，其与0.078和F类似于69％。可以通过调整点参数来解释光曲线中观察到的变化。 V53属于极端质量比（Q <= 0.25），深触点（F> = 50％）二进制文件，其质量比接近理论研究预测的最小质量比，使其成为研究演变的潜在物体二进制文件和蓝色摔跤手和FK COM型星的形成。 V53的轨道周期显示DP / DT = 5.89（+/- 0.02）×10（-8）瓦尔（-1）的速率下的长期减少。该世俗期间的降低可能是由从更巨大的组分到较少大量成分的质量转移和通过磁动制动的角动量损耗来引起的。随着该传质和角动量损失的继续，V53最终将进化成单个快速旋转星。通过研究已经分析的全球簇中所有联系二进制文件的统计数据，我们发现了接触程度与联系二进制是蓝色孤立器之间的可能相关性。当其填充因子超过46.25（+/- 2.05）％时，触点二进制可能会成为蓝色级体。应引入更多样本以确认未来的初步结果。

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