论文标题
恒星三倍作为BA星星的来源
Stellar Triples as a Source for Ba Stars
论文作者
论文摘要
在过去的几十年中，已经对钡恒星进行了广泛的研究，但是我们目前对这些有趣的物体形成的物体的理解还有很多不足之处。经典的二进制进化模型无法令人满意地解释在包含钡星的系统中观察到的许多趋势，自然提出了三元组和其他高阶倍数是否会引起此类外来物体的问题。在本文中，我们研究了从层次三重系统中的第三纪的Roche Lobe溢出的可能性，可能会导致内部二进制内部的表面钡富集，同时导致内部二进制合并，从而产生钡恒星。这种可能性有可能形成大部分的钡恒星，因为从第三纪的Roche Lobe溢出通常比二进制伴侣的近距离轨道更稳定。考虑到可以实现这一目标的各种形成通道和机制，并且在每种情况下对相对形成率的限制都放置。我们得出的结论是，钡恒星的比例是由分层三重系统形成，并且在可以完全了解钡恒星种群之前，需要进一步研究。
Barium stars have been studied extensively over the past few decades, yet our current understanding of how these intriguing objects formed leaves much to be desired. Many trends observed in systems containing barium stars cannot be satisfactorily explained by classical binary evolution models, naturally raising the question of whether triples and other higher-order multiples can give rise to such exotic objects. In this paper, we study the possibility that a Roche Lobe overflow from a tertiary in a hierarchical triple system can potentially lead to surface barium enrichment within the inner binary, while at the same time causing the inner binary to merge, thereby producing a barium star. This possibility has the potential to form a large proportion of Barium stars, as Roche Lobe overflow from a tertiary is typically much more stable for close orbits than that from a binary companion. Various formation channels and mechanisms by which this can be achieved are considered, and constraints on relative formation rates are placed on each scenario. We conclude that a significant, if not dominant, proportion of barium stars are formed from hierarchical triple systems, and that further studies are required in this area before a complete understanding of Barium star populations can be achieved.
