论文标题
Gaia DR2中具有共同运动的二元星人口
Binary Star Population with Common Proper Motion in Gaia DR2
论文作者
论文摘要
我们描述了基于GAIA DR2的常见合适运动星的同质目录汇编。在太阳周围的100 pc中的所有恒星列表的初步列表被汇编而成，分隔少于parsec。此外，选择了一组共同的对，宽二元星星。多重性大于2的群集和系统被排除在考虑之外。所得目录包含10358对恒星。通过与一组随机选择的现场恒星以及通过种群合成获得的模型样本进行比较来估计目录的选择性函数。分类物体中恒星质量的估计值属于主要序列，显示出过量的“双胞胎”，由具有相似质量的恒星组成。随着组件之间的分离的增加，这种过度会减少。结果表明，这种效果不能仅是选择性函数的结果，并且在模型中不会出现在类似质量的恒星形成不是人为优选的模型中。该文章基于会议上的演讲“昨天，今天，明天的天文程统”（莫斯科州立大学斯特恩伯格天文学院，2019年10月14日至16日）。
We describe a homogeneous catalog compilation of common proper motion stars based on Gaia DR2. A preliminary list of all pairs of stars within the radius of 100 pc around the Sun with a separation less than a parsec was compiled. Also, a subset of comoving pairs, wide binary stars, was selected. The clusters and systems with multiplicity larger than 2 were excluded from consideration. The resulting catalog contains 10358 pairs of stars. The catalog selectivity function was estimated by comparison with a set of randomly selected field stars and with a model sample obtained by population synthesis. The estimates of the star masses in the catalogued objects, both components of which belong to the main-sequence, show an excess of "twins", composed by stars with similar masses. This excess decreases with increasing separation between components. It is shown that such an effect cannot be a consequence of the selectivity function only and does not appear in the model where star formation of similar masses is not artificially preferred. The article is based on the talk presented at the conference "Astrometry yesterday, today, tomorrow" (Sternberg Astronomical Institute of the Moscow State University, October 14-16, 2019).
