Title: The Effect of Environment on Massive Star Formation Show Chinese title

Title: 环境对大质量恒星形成的影响

Abstract: In this contribution we review our recent numerical work discussing the essential role of the local cluster environment in assembling massive stars. First we show that massive stars are formed from low mass pre-stellar cores and become massive due to accretion. Proto-stars that benefit from this accretion are those situated at the centre of a cluster's potential well, which is the focal point of the contraction of the cluster gas. Given that most of the mass which makes up a massive star in this model comes from the cluster environment rather than the core, it is important to model the molecular cloud environment accurately. Preliminary results of a simulation which accurately treats the chemistry and time-dependent thermodynamics of a molecular cloud show quantitatively similar star formation to previous models, but allow a true comparison to be made between simulation and observations. This method can also be applied to cases with varying metallicities allowing star formation in primordial gas to be studied. In general, these numerical studies of clustered star formation yield IMFs which are compatible with the Salpeter mass function. The only possible exception to this is in low density unbound regions of molecular clouds which lack very low and high mass stars. Show Chinese abstract

Abstract: 在这篇贡献中，我们回顾了近期关于局部星团环境在组装大质量恒星中起关键作用的数值研究工作。 首先，我们展示了大质量恒星是由低质量的前恒星核形成，并由于吸积而变得质量巨大。从这种吸积中受益的原恒星位于星团势阱的中心，这是星团气体收缩的焦点。 鉴于在这个模型中构成大质量恒星的大部分质量来自星团环境而不是核心，因此准确地模拟分子云环境至关重要。 一个准确处理分子云化学和时变热力学的模拟的初步结果显示，与之前的模型相比，恒星形成的定量相似性，但允许在模拟和观测之间进行真正的比较。 这种方法也可以应用于不同金属丰度的情况下，从而可以研究原始气体中的恒星形成。 总的来说，这些关于星团恒星形成的数值研究表明，它们产生的初始质量函数与Salpeter质量函数相容。唯一的可能例外是在缺乏非常低质量和高质量恒星的分子云的低密度非束缚区域。