Gas expulsion versus gas retention in young stellar clusters–II. Effects of cooling and mass segregation
Gas expulsion versus gas retention in young stellar clusters–II. Effects of cooling and mass segregation
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年轻恒星团中的气体排出与气体保留 - II。
DOI：
10.1093/mnras/sty1383
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发表时间：
2018
影响因子：
4.8
通讯作者：
G. Tenorio
中科院分区：
文献类型：
--
作者：
S. Silich;G. Tenorio
气体排出或气体保留是球状星团中多恒星群和轻元素反关联的大多数模型的中心问题。对于理解现代和古代恒星形成星系中的恒星形成是如何进行的，以及具有多个恒星群的原球状星团是否在当今时代形成，残余物质能否成功地排出或保留在年轻星团中也是至关重要的。通常认为，要么是残余气体被恒星风和超新星爆炸从恒星形成云中迅速抛出，要么是残余气体的浓缩和第二代恒星的形成发生得如此之快，以至于恒星的负反馈并不显著。在这里，我们继续研究极端环境下星团的早期发展，并讨论强辐射冷却和恒星质量分离对致密恒星形成云中气体排放的限制。讨论了恒星形成云的大范围物理初始条件，包括恒星形成云质量、致密性、气体金属丰度、恒星形成效率和大质量恒星分凝的影响。结果表明，在足够大的质量和致密的星团中，单个大质量恒星周围的热激波风在与其邻居合并之前可能会冷却。这极大地减少了恒星的负反馈，防止了全球星团风的发展和残余物和加工物质向周围星际介质的喷射。得到了区分瓦斯排出和滞留状态的临界线。
Gas expulsion or gas retention is a central issue in most of the models for multiple stellar populations and light element anti-correlations in globular clusters. The success of the residual matter expulsion or its retention within young stellar clusters has also a fundamental importance in order to understand how star formation proceeds in present-day and ancient star-forming galaxies and if proto-globular clusters with multiple stellar populations are formed in the present epoch. It is usually suggested that either the residual gas is rapidly ejected from star-forming clouds by stellar winds and supernova explosions, or that the enrichment of the residual gas and the formation of the second stellar generation occur so rapidly, that the negative stellar feedback is not significant. Here we continue our study of the early development of star clusters in the extreme environments and discuss the restrictions that strong radiative cooling and stellar mass segregation provide on the gas expulsion from dense star-forming clouds. A large range of physical initial conditions in star-forming clouds which include the star-forming cloud mass, compactness, gas metallicity, star formation efficiency and effects of massive stars segregation are discussed. It is shown that in sufficiently massive and compact clusters hot shocked winds around individual massive stars may cool before merging with their neighbors. This dramatically reduces the negative stellar feedback, prevents the development of the global star cluster wind and expulsion of the residual and the processed matter into the ambient interstellar medium. The critical lines which separate the gas expulsion and the gas retention regimes are obtained.
影响因子：
4.8
作者：
Cabrera-Ziri, I.;Bastian, N.;Hibbard, J. E.
通讯作者：
Hibbard, J. E.