Abstract—

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 10 358 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).

中文翻译：

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Gaia DR2中具有适当适当运动的双星群

摘要-

我们描述了基于Gaia DR2的常见固有运动星的同构目录汇编。编制了太阳周围100 pc半径内，间隔小于一秒差距的所有成对星的初步清单。同样，选择了运动对的子集，即宽双星。排除了大于2的集群和系统。生成的目录包含10 358对星星。通过与一组随机选择的野外星和通过种群合成获得的模型样本进行比较，估计了目录选择性函数。分类物体中恒星质量的估计（这两个分量都属于主序列）显示出过多的“双胞胎”，由质量相似的恒星组成。随着组分之间的分离增加，该过量减少。结果表明，这种效应不能仅是选择性函数的结果，并且不会出现在并非人工优选类似质量恒星形成的模型中。本文基于在“昨天，今天，明天的天体测量”会议上发表的演讲（莫斯科国立大学斯特恩伯格天文研究所，2019年10月14日至16日）。