论文标题
研究开放群集区域NGC 381中的恒星变异性
Investigating stellar variability in the open cluster region NGC 381
论文作者
论文摘要
我们使用在27晚中观察到的光度数据在开放群集NGC 381领域中研究可变恒星，并确定总共57个可变星，其中五个是成员恒星。根据H-R图中的周期，幅度，光曲线形状和位置对变量恒星进行分类。我们在集群中发现了各种各样的可变恒星。我们总共确定了10种黯然失色的二进制文件，其中2种是Algol型（EA），而8种是W uma型（EW）二进制文件。这些EW二进制文件的估计年龄大于0.6 Gyr，这与短期黯然失色的二进制文件的形成时间约束> 0.6 GYR一致。三种EW类型二进制文件的物理参数的估计是使用Phoebe模型拟合软件进行的。脉动变量恒星各个来自δScuti和γDOR变异性类别的恒星。我们在FAMIAS软件包的帮助下确定了脉动变量的脉动模式。我们获得了15个旋转变量星星，其中包含四个矮星（g）与log（tef f）图的四个矮星。发现这些矮星的周期通常比其余的旋转变量更大。
We study variable stars in the field of the open cluster NGC 381 using photometric data observed over 27 nights and identify a total of 57 variable stars out of which five are member stars. The variable stars are classified based on their periods, amplitudes, light curve shapes, and locations in the H-R diagram. We found a rich variety of variable stars in the cluster. We identified a total of 10 eclipsing binaries out of which 2 are Algol type (EA) while 8 are W UMa type (EW) binaries. The estimated ages of these EW binaries are greater than 0.6 Gyr which is in agreement with the formation time constraint of > 0.6 Gyr on short-period eclipsing binaries. The estimation of the physical parameters of the three EW type binaries is done using PHOEBE model-fitting software. The pulsating variable stars include one each from δ Scuti and γ Dor variability class. We determined the pulsation modes of pulsating variables with the help of the FAMIAS package. We obtained 15 rotational variables stars comprising four dwarf stars identified on the basis log(g) versus log(Tef f ) diagram. These dwarf stars are found to have generally larger periods than the remaining rotational variables.
