Eclipsing high-mass binaries - I. Light curves and system parameters for CPD − 51° 8946, PISMIS 24-1, and HD 319702
Eclipsing high-mass binaries - I. Light curves and system parameters for CPD − 51° 8946, PISMIS 24-1, and HD 319702
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DOI：
10.1051/0004-6361/201321642
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发表时间：
2013-06
影响因子：
6.5
通讯作者：
A. Domínguez;R. Chini;F. Pozo Nuñez;M. Haas;M. Hackstein;H. Drass;R. Lemke;M. Murphy
中科院分区：
文献类型：
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作者：
A. Domínguez;R. Chini;F. Pozo Nuñez;M. Haas;M. Hackstein;H. Drass;R. Lemke;M. Murphy
我们介绍了在智利塞罗阿尔马宗附近的波鸿大学使用机器人双折射望远镜进行的全面光度测量O-STAR的第一批结果。对于三颗大质量恒星，Pismis 24-1，Cpd−51◦8946和HD 319702，我们通过拉夫勒-金曼算法确定了周期，并在罗氏几何框架内模拟了光曲线。对于已知的食双星Pismis24-1，我们给出了第一条光曲线，并测定了它的光度周期为2.36天，轨道倾角为61.8◦。灯光曲线的最佳模型解决方案表明是分离的配置。在初级温度t1=42520K的情况下，我们得到了二次组分的温度t2=41500K。CPD−51◦8946系统是另一个已知的食双星，我们给出了它的修正光度周期为1.96d，轨道倾角为58.4◦。该系统可能具有半分离构型，质量比Q=M1/M2=2.8。如果我们采用初级温度t1=34 550K，我们得到第二组分的t2=21500K。HD 319702系统是新发现的年轻疏散星团NGC6334的日食双星。该系统显示了清晰的日食，有利于分离的构型，周期为2.0d，轨道倾角为67.5◦。将我们的测光结果与初级光谱类型O8 III(F)(t1=34000K)相结合，我们得到二级成分的温度t2=25200K。
We present the first results of a comprehensive photometric O-star survey performed with a robotic twin refractor at the Universitatssternwarte Bochum located near Cerro Armazones in Chile. For three high-mass stars, Pismis 24-1, CPD −51 ◦ 8946, and HD 319702, we determined the period through the Lafler-Kinman algorithm and modelled the light curves within the framework of the Roche geometry. For Pismis 24-1, a previously known eclipsing binary, we provide the first light curves and determined a photometric period of 2.36 days together with an orbital inclination of 61.8 ◦ . The best-fitting model solution to the light curves suggests a detached configuration. With a primary temperature of T1 = 42 520 K we obtained the temperature of the secondary component as T2 = 41 500 K. The CPD − 51 ◦ 8946 system is another known eclipsing binary for which we present a revised photometric period of 1.96 days with an orbital inclination of 58.4 ◦ . The system probably has a semi-detached configuration and a mass ratio q = M1/M2 = 2.8. If we adopt a primary temperature of T1 = 34 550 K, we obtain T2 = 21 500 K for the secondary component. The HD 319702 system is a newly discovered eclipsing binary member of the young open cluster NGC 6334. The system shows well-defined eclipses favouring a detached configuration with a period of 2.0 days and an orbital inclination of 67.5 ◦ . Combining our photometric result with the primary spectral type O8 III(f) (T1 = 34 000 K) we derive a temperature of T2 = 25 200 K for the secondary component.