arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节（Veterans Day），12 日无更新
arXiv 1806.01294astro-ph.SR
收藏

明亮大质量恒星周围的IR星云作为双星相互作用的指示器

IR nebulae around bright massive stars as indicators for binary interactions

Julia Bodensteiner, Dietrich Baade, Jochen Greiner, Norbert Langer

备注：
21 pages, 5 tables, 6 figures, accepted for publication in A&A
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

最近的研究表明，超过70%的大质量恒星并不是以有效的单星形式演化，而是作为相互作用的双星系统的成员。因此，这些恒星的演化与类似但孤立的物体相比发生了强烈的变化。我们研究了早型恒星周围秒差距尺度中红外星云的存在。如果它们存在于广泛的恒星性质中，一个可能的总体解释是二元相互作用中的非保守质量转移，或恒星合并。对于~3850颗恒星（亮星表[BSC]中的所有OBA星，Be星，BeXRB和Be+sdO系统），我们目视检查WISE 22 $μ$ m图像。根据星云的形状和相对位置，我们区分五类：偏移弓形激波结构上与恒星空间速度一致，不一致的偏移弓形激波，以及居中的，未解决的，未分类的星云。在BSC中，我们发现28%，13%和0.4%的O，B和A星，分别拥有相关的红外（IR）星云。此外，34/234 Be星、4/72 BeXRB和3/17 Be+sdO系统与红外星云有关。对准或不对准的弓形激波是由恒星和星际介质（ISM）之间的高相对速度引起的，它们分别由恒星或ISM主导。大约13%的中心星云可能是头部或尾部的弓形激波，对于其余的星云，数据不支持解释为父母盘的残骸，前一个伴星的超新星遗迹，以及恒星风中的尘埃产物。在银河系高纬度地区也存在有中心的星云，这极大地限制了与ISM中的凝聚体巧合对齐的全球风险。在双星演化过程中的质量损失似乎是形成这些星云中至少一部分的可行机制。总的来说，大约29%的红外星云（占BSC中所有OBA恒星的2%）可以在双星演化的背景下找到它们的解释。

英文摘要：

Recent studies show that more than 70% of massive stars do not evolve as effectively single stars, but as members of interacting binary systems. The evolution of these stars is thus strongly altered compared to similar but isolated objects. We investigate the occurrence of parsec-scale mid-infrared nebulae around early-type stars. If they exist over a wide range of stellar properties, one possible overarching explanation is non-conservative mass transfer in binary interactions, or stellar mergers. For ~3850 stars (all OBA stars in the Bright Star Catalogue [BSC], Be stars, BeXRBs, and Be+sdO systems), we visually inspect WISE 22 $μ$m images. Based on nebular shape and relative position, we distinguish five categories: offset bow shocks structurally aligned with the stellar space velocity, unaligned offset bow shocks, and centered, unresolved, and not classified nebulae. In the BSC, we find that 28%, 13%, and 0.4% of all O, B, and A stars, respectively, possess associated infrared (IR) nebulae. Additionally, 34/234 Be stars, 4/72 BeXRBs, and 3/17 Be+sdO systems are associated with IR nebulae. Aligned or unaligned bow shocks result from high relative velocities between star and interstellar medium (ISM) that are dominated by the star or the ISM, respectively. About 13% of the centered nebulae could be bow shocks seen head- or tail-on. For the rest, the data disfavor explanations as remains of parental disks, supernova remnants of a previous companion, and dust production in stellar winds. The existence of centered nebulae also at high Galactic latitudes strongly limits the global risk of coincidental alignments with condensations in the ISM. Mass loss during binary evolution seems a viable mechanism for the formation of at least some of these nebulae. In total, about 29% of the IR nebulae (2% of all OBA stars in the BSC) may find their explanation in the context of binary evolution.

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。

↑