论文标题
年龄对开放集群分组的影响：ii。有旧的二进制簇吗？
The Effect of Age on the Grouping of Open Clusters: II. Are there old binary clusters?
论文作者
论文摘要
在本研究中，我们继续检验原始群体假设（Casado 2022），该假设假设只有足够年轻的开放式簇才能是二元或多个，并且旧簇基本上是单个的。为此，我们通过Gaia数据和文献仔细修订的银河系中的所有剩余的二进制群集候选者重新访问了至少一个超过100 MYR的群集。在120对/组中，我们发现旧的二元系统没有令人信服的案例。大多数对是光学对或飞行对遇到的。但是，我们发现了三对可疑对，可以在进一步研究中伪造标题假设。我们还发现了两个可能比预期的原始对。我们的结果证实，银河系中的绝大多数二进制/多个OC（如果不是全部）都是原始的，并且很长一段时间内都不稳定。这一发现与银河系中的麦哲伦云和理论N体模拟相似。这些组中的OC对通常不是二元系统，因为它们没有重力结合。我们还指出了以前的作品和数据库中的一些不一致之处，例如错误的开放群集和重复。
In the present study, we continue testing the Primordial Group hypothesis (Casado 2022), which postulates that only sufficiently young open clusters can be binary or multiple, and old clusters are essentially single. To this end, we revisit all the remaining binary cluster candidates in the Galaxy having at least one cluster older than 100 Myr through Gaia data and careful revision of the literature. We have found no convincing case for an old binary system among the 120 pairs/groups revised. Most of the pairs are optical pairs or flyby encounters. However, we have found three dubious pairs that could falsify the title hypothesis upon further research. We also have found two possible primordial pairs older than expected. Our results confirm that the vast majority of binary/multiple OCs in the Galaxy, if not all, are of primordial origin and are not stable for a long time. This finding is in line with similar studies of the Magellanic Clouds and theoretical N-body simulations in the Galaxy. The pairs of OCs in these groups are generally not binary systems since they are not gravitationally bound. We also point out some inconsistencies in previous works and databases, such as false open clusters and duplicities.
