论文标题
通过研究由流出污染的星星来学习AGB星星
Learning about AGB stars by studying the stars polluted by their outflows
论文作者
论文摘要
当渐近巨型分支（AGB）恒星在二元系统中进行相互作用时，形成了富有特殊物体的动物园。例如，钡（BA）恒星是主要的恒星和红色巨星，它从前AGB伴侣的流出中积聚了质量，现在是昏暗的白矮人（WD）。它们的轨道特性可以帮助我们限制AGB二元相互作用机制，它们的化学丰度是前AGB恒星内发生的核合成过程的示踪剂。在过去的几年中，关于BA恒星的轨道和恒星特性的观察性约束有所增加，但与WD同伴有关的重要不确定性仍然存在。在这项贡献中，我们使用HD76225来证明，通过将径向速度数据与河马和Gaia星形法相结合，可以准确地限制这些系统的轨道倾斜度，并通过初始预定质量关系获得有关其AGB祖细胞的绝对质量，从而获得这些WDS的绝对质量。
A rich zoo of peculiar objects forms when Asymptotic Giant Branch (AGB) stars, undergo interactions in a binary system. For example, Barium (Ba) stars are main-sequence and red-giant stars that accreted mass from the outflows of a former AGB companion, which is now a dim white dwarf (WD). Their orbital properties can help us constrain AGB binary interaction mechanisms, and their chemical abundances are a tracer of the nucleosynthesis processes that took place inside the former AGB star. The observational constraints concerning the orbital and stellar properties of Ba stars have increased in the past years, but important uncertainties remained concerning their WD companions. In this contribution, we used HD76225 to demonstrate that by combining radial-velocity data with Hipparcos and Gaia astrometry, one can accurately constrain the orbital inclinations of these systems and obtain the absolute masses of these WDs, getting direct information about their AGB progenitors via initial-final mass relationships.
