Photometric analysis of a blue straggler eclipsing binary in the old open cluster NGC 2141
Photometric analysis of a blue straggler eclipsing binary in the old open cluster NGC 2141
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DOI：
10.1007/s11433-012-4814-6
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发表时间：
2012-06
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影响因子：
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通讯作者：
Yangping Luo;Bo Wang;Hai-liang Chen;Xiaobin Zhang;Zhanwen Han
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作者：
Yangping Luo;Bo Wang;Hai-liang Chen;Xiaobin Zhang;Zhanwen Han
为了了解疏散星团中蓝离散星的形成机制，我们对老疏散星团NGC 2141中的一个蓝离散星食双星进行了光度分析。利用极小时刻的最小二乘拟合，得到了该系统的星历，并重新确定了该系统的轨道周期为0.6227d。利用Wilson-Devinney规范（2003）对光变曲线进行了光度分析。光度的解决方案揭示了一个半分离的二进制与第二部分填充其洛希瓣。测得次级/初级光度质量比M2/M1为0.190±0.002，V带光度比L2/L1（V）约为0.033±0.001，表明次级成分是过发光的。因此，这颗蓝离散星可能是由这两个成分之间的大量质量交换造成的。
To understand the formation mechanism of blue stragglers in open clusters, we conducted a photometric analysis for a blue straggler eclipsing binary in the old open cluster NGC 2141. By using the least square fitting of times of minima, we derived the ephemeris and redetermined the orbital period of this system to be 0.6227 d. We have also done a photometric analysis for light curve with the Wilson-Devinney Code (2003). The photometric solutions reveal a semi-detached binary with the secondary component filling its Roche lobe. The photometric mass ratioM2/M1(secondary/primary) was determined to be 0.190±0.002 and the ratio ofV-band luminosityL2/L1(V) is about 0.033±0.001, which indicates the secondary component is overluminous. Thus, this blue straggler likely results from a substantial mass exchange between these two components.