论文标题
在pleiades星团中间质量范围内未解决的二进制
Unresolved Binaries in the Intermediate Mass Range in the Pleiades Star Cluster
论文作者
论文摘要
在解决的恒星种群中鉴定不同质量比的二元星是一项艰巨的任务。我们展示了如何使用伪色（H-W2）-W1 vs W2-（BP-K）构建的光度图来估计二进制和多星级比率及其组件质量比$ q $的分布。作为一个应用程序，我们研究了pleiades星团在0.5至1.8 $ m _ {\ odot} $之间的主要组件质量范围内。发现二进制星比在0.54 $ \ pm $ 0.11和0.70 $ \ pm $ 0.14之间。另一方面，多重性超过2的系统比率在0.10 $ \ pm $ 0.00和0.14 $ \ pm $ 0.01之间。电源法近似于-0.53 $ \ pm $ 0.10 $ 0.10和-0.63 $ \ pm $ 0.22。低于0.5 $ m _ {\ odot} $，我们预计辅助组件中有大量的棕色矮人。
The identification of binary stars of different mass ratios in resolved stellar populations is a challenging task. We show how the photometric diagram constructed with the pseudo-colors (H-W2)-W1 vs W2-(BP-K) can be employed to estimate the binary and multiple star ratios and the distribution of their component mass ratio $q$ effectively. As an application, we investigate the Pleiades star cluster in the range of primary component mass between 0.5 and 1.8 $M_{\odot}$. The binary star ratio is found to be between 0.54$\pm$0.11 and 0.70$\pm$0.14. On the other hand, the ratio of systems with multiplicity more than 2 is between 0.10$\pm$0.00 and 0.14$\pm$0.01. The distribution of the component mass ratio $q$ has been approximated by a power law with the exponent between -0.53$\pm$0.10 and -0.63$\pm$0.22. Below 0.5 $M_{\odot}$, we expect a large number of brown dwarfs among secondary components.
