arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.04008astro-ph.SRastro-ph.GA
收藏

重新访问拱门集群:IV。超大质量恒星双星性质的观测约束

The Arches cluster revisited: IV. Observational constraints on the binary properties of very massive stars

J. S. Clark, M. E. Lohr, F. Najarro, L. R. Patrick, B. W. Ritchie

摘要:

作为电磁波和引力波瞬变的前身,大质量恒星近年来重新引起人们的兴趣。然而,它们的诞生和演变的许多方面仍然是不透明的,特别是在二元互动的背景下。我们银河系的中心拥有一群非常巨大的恒星,它们似乎在该地区的生态中发挥着重要作用。在本文中,我们调查的拱门集群,这被认为是主机的大量非常大质量的恒星的二进制属性。多历元近红外光谱和光度学的组合被用来识别双星。36个聚类成员中有13个符合我们的标准,被归类为RV变量。将光谱数据与存档的无线电和X射线观测相结合,以检测碰撞风系统,提供了一个约43%的双星比例下限;对于O-型超巨星和WNLha,增加到>50%。动力学和演化的质量揭示了主星系的质量是均匀的(> 50 M $_{\odot}$)。在可能的情况下,轨道分析揭示了一些短周期,高度偏心的双星,这似乎是预相互作用系统。这样的系统是X射线发光的,80%以上的经验界的$(L_{\rm x}/L_{\rm bol})\sim10^{-7}$和他们的轨道配置建议通过一个单一的恒星通道的形成和演变,但是,我们不能排除一个子集的二进制形成通道。与低质量OB-型恒星的调查定性比较证实,极端双星比例(>60%)的趋势延伸到目前在本地宇宙中形成的质量最大的恒星。

英文摘要:

Serving as the progenitors of electromagnetic and gravitational wave transients, massive stars have received renewed interest in recent years. However, many aspects of their birth and evolution remain opaque, particularly in the context of binary interactions. The centre of our galaxy hosts a rich cohort of very massive stars, which appear to play a prominent role in the ecology of the region. In this paper we investigate the binary properties of the Arches cluster, which is thought to host a large number of very massive stars. A combination of multi-epoch near-IR spectroscopy and photometry was utilised to identify binaries. 13 from 36 cluster members meet our criteria to be classed as RV variable. Combining the spectroscopic data with archival radio and X-ray observations - to detect colliding wind systems - provides a lower limit to the binary fraction of ~43%; increasing to >50% for the O-type hypergiants and WNLha. Dynamical and evolutionary masses reveal the primaries to be uniformly massive (>50M$_{\odot}$). Where available, orbital analysis reveals a number of short period, highly eccentric binaries, which appear to be pre-interaction systems. Such systems are X-ray luminous, with 80% above an empirical bound of $(L_{\rm x}/L_{\rm bol})\sim10^{-7}$ and their orbital configurations suggest formation and evolution via a single star channel; however, we cannot exclude a binary formation channel for a subset. Qualitative comparison to surveys of lower mass OB-type stars confirms that the trend to an extreme binary fraction (>60%) extends to the most massive stars currently forming in the local Universe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑