高质量恒星的吸积历史：ArTéMiS对红外暗云的初步研究
The accretion history of high-mass stars: An ArTéMiS pilot study of Infrared Dark Clouds
摘要：
原恒星的质量增长是确定初始质量函数等基本恒星星族性质的核心因素。因此，限制单个原恒星的吸积历史是恒星形成研究的一个重要方面。本研究的目标是确定高质量恒星（原恒星）是否从致密（<0.1pc）的固定质量气体库（通常称为致密核心）获得质量，或者高质量恒星的质量增长是否由通常围绕它们的秒差距尺度团块的动力学演化所控制。为了实现这一目标，我们使用APEX上的ArTéMiS相机对11个红外暗云及其邻近的一些团块进行了350微米的连续映射。通过识别大约200个紧凑的ArTéMiS源，并将它们与Herschel Hi-GAL 70微米源相匹配，我们已经能够产生质量与温度图。我们比较的性质（即无星或原恒星）和位置的ArTéMiS源在这些图中模拟的核心喂养和团块喂养吸积方案的演化轨迹。我们认为，后者提供了一个更好的协议与观察到的高质量恒星形成的核心分布。然而，关于大质量恒星吸积历史的问题，一个强有力的和明确的结论需要更大的数字统计。
英文摘要：
The mass growth of protostars is a central element to the determination of fundamental stellar population properties such as the initial mass function. Constraining the accretion history of individual protostars is therefore an important aspect of star formation research. The goal of the study presented here is to determine whether high-mass (proto)stars gain their mass from a compact (<0.1pc) fixed-mass reservoir of gas, often referred to as dense cores, in which they are embedded, or whether the mass growth of high-mass stars is governed by the dynamical evolution of the parsec-scale clump that typically surrounds them. To achieve this goal, we performed a 350micron continuum mapping of 11 infrared dark clouds, along side some of their neighbouring clumps, with the ArTéMiS camera on APEX. By identifying about 200 compact ArTéMiS sources, and matching them with Herschel Hi-GAL 70micron sources, we have been able to produce mass vs. temperature diagrams. We compare the nature (i.e. starless or protostellar) and location of the ArTéMiS sources in these diagrams with modelled evolutionary tracks of both core-fed and clump-fed accretion scenarios. We argue that the latter provide a better agreement with the observed distribution of high-mass star-forming cores. However, a robust and definitive conclusion on the question of the accretion history of high-mass stars requires larger number statistics.
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