Photometric analysis of a blue straggler eclipsing binary in the old open cluster NGC 2141

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...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2012-08, Vol.55 (8), p.1500-1504
Main Authors: Luo, YangPing, Wang, Bo, Chen, HaiLiang, Zhang, XiaoBin, Han, ZhanWen
Format: Article
Language:English
Subjects:
Astronomy
China
Classical and Continuum Physics
Eclipsing binary stars
Fittings
Least squares method
Light curve
Lobes
Luminosity
Minima
NGC
Observations and Techniques
Open clusters
Orbits
Photometry
Physics
Physics and Astronomy
光变曲线
光度分析
最小二乘拟合
疏散星团
蓝离散星
轨道周期
食双星
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Summary: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 second- ary component filling its Roche lobe. The photometric mass ratio MJMI （secondary/primary） was determined to be 0.190_＋0.002 and the ratio of V-band luminosity L2/LI（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.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-012-4814-6