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arXiv 2305.04415astro-ph.GA
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揭示开放星团形成的初始条件

Unveiling the initial conditions of open star cluster formation

C. J. Hao, Y. Xu, L. G. Hou, Z. H. Lin, Y. J. Li

AI总结:

本研究利用Gaia数据揭示开放星团形成的初始条件,通过动力学方法推导其前身团块质量,发现O型星的破坏性反馈导致多数嵌入星团瓦解,仅致密者幸存为开放星团。

摘要:

开放星团(OCs)是在分子云中孕育的嵌入星团中罕见的幸存者。迄今为止,关于OCs形成的初始条件知之甚少。在此,我们利用Gaia数据发布3提供的高精度天体测量参数研究了这一问题。统计表明,OCs的奇异运动速度从幼年期到老年期变化很小,这为利用OCs追踪其前身星团提供了绝佳机会。采用动力学方法,我们推导了OCs诞生所在的前身团块的质量,这些团块具有与先前在银河系中观测到的团块相当的统计特征。此外,OCs前身团块的质量表明它们应能够孕育大质量O型星。事实上,在检查观测到的OCs和O型星后,我们发现OCs中存在许多O型星。来自O型星的破坏性恒星反馈可能瓦解绝大多数嵌入星团,只有那些足够致密的才能作为OCs幸存下来。

英文摘要:

Open clusters (OCs) are infrequent survivors of embedded clusters gestated in molecular clouds. Up to now, little is known about the initial conditions for the formation of OCs. Here, we studied this issue using high-precision astrometric parameters provided by Gaia data release 3. The statistics show that the peculiar motion velocities of OCs vary little from infancy to old age, providing a remarkable opportunity to use OCs to trace their progenitors. Adopting a dynamical method, we derived the masses of the progenitor clumps where OCs were born, which have statistical characteristics comparable to previously known results for clumps observed in the Galaxy. Moreover, the masses of the progenitor clumps of OCs indicate they should be capable of gestating massive O-type stars. In fact, after inspecting the observed OCs and O-type stars, we found that there are many O-type stars in OCs. The destructive stellar feedback from O-type stars may disintegrate the vast majority of embedded clusters, and only those sufficiently dense ones can survive as OCs.

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。

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