Evidence for feedback and stellar-dynamically regulated bursty star cluster formation: the case of the Orion Nebula Cluster

Evidence for feedback and stellar-dynamically regulated bursty star cluster formation: the case of the Orion Nebula Cluster
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反馈和恒星动力学调节的爆发性星团形成的证据:猎户座星云团的案例

DOI:
10.1051/0004-6361/201732151
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发表时间:
2018
影响因子:
6.5
通讯作者:
Zhiqiang Yan
Zhiqiang Yan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
P. Kroupa;T. Jeřábková;F. Dinnbier;G. Beccari;Zhiqiang Yan

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(节略)一个场景的形成多个同时代的人口年龄分离约1万年在非常年轻的集群(VYC,年龄小于10万年)和质量范围600-20000 Msun的概述。它依赖于聚合的分子气体流入,建立了前主序星的第一个人口。与之相伴的刚形成的O型星电离了恒星的流入,抑制了嵌入星团中星星的形成。然而,它们通常会在10^6年内相互弹射出嵌入的星团,也就是说,在分子云丝完全电离之前。分子气体的流入然后可以恢复形成第二群体。这一系列事件可以多次重复。这个模型被应用到猎户座星云团(ONC),其中三个良好分离的前主序列的颜色星等图的集群最近被发现。使用这个模型的质量流入的历史受到限制,并估计从每个人口中喷出的OB星的数量,使用盖亚数据进行验证。作为所提出的模型的结果,三个失控的O星星系统,AE Aur,μ Col和iota Ori,被认为是重要的观测证据,恒星动力学喷射的大质量恒星从最古老的人口在ONC。
(abridged) A scenario for the formation of multiple co-eval populations separated in age by about 1 Myr in very young clusters (VYCs, ages less than 10 Myr) and with masses in the range 600-20000 Msun is outlined. It rests upon a converging inflow of molecular gas building up a first population of pre-main sequence stars. The associated just-formed O stars ionise the inflow and suppress star formation in the embedded cluster. However, they typically eject each other out of the embedded cluster within 10^6 yr, that is before the molecular cloud filament can be ionised entirely. The inflow of molecular gas can then resume forming a second population. This sequence of events can be repeated multiply. This model is applied to the Orion Nebula Cluster (ONC), in which three well-separated pre-main sequences in the color-magnitude diagram of the cluster have recently been discovered. The mass-inflow history is constrained using this model and the number of OB stars ejected from each population are estimated for verification using Gaia data. As a consequence of the proposed model, the three runaway O star systems, AE Aur, mu Col and iota Ori, are considered as significant observational evidence for stellar-dynamical ejections of massive stars from the oldest population in the ONC.
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发表时间: 2016-11
影响因子: 6.5
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影响因子: --
作者:
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