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An upper limit to the masses of stars

机译:恒星质量的上限

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There is no accepted upper mass limit for stars. Such a basic quantity eludes both theory and observation, because of an imperfect understanding of the star-formation process and because of incompleteness in surveying the Galaxy(1). The Arches cluster(2-7) is ideal for investigating such limits, being large enough to expect stars at least as massive as similar to500 solar masses (similar to500 M-.; based on a typical mass function), and young enough for its most massive members to still be visible. It is also old enough to be free of its natal molecular cloud, it is at a well-established distance, and it is close enough for us to discern its individual stars(2). Here I report an absence of stars with initial masses greater than 130 M-. in the Arches cluster, whereas the typical mass function predicts 18. I conclude that this indicates a firm limit of 150M(.) for stars; the probability that the observations are consistent with there being no upper limit is 10(-8).
机译:恒星没有公认的质量上限。由于对恒星形成过程的理解不完善以及对银河系的测量不完整,所以这样的基本量既没有理论又没有观测到(1)。拱门星团(2-7)非常适合研究这样的限制,它足够大,可以期待恒星至少质量与500个太阳质量(类似于500 M- .;基于典型的质量函数)相同,并且足够年轻最庞大的成员仍然可见。它的年龄也足够长,可以摆脱其天生的分子云,它已经建立了良好的距离,并且距离我们足够近,可以分辨出它的各个恒星(2)。在这里,我报告缺少初始质量大于130 M-的恒星。在“拱门”星团中,典型的质量函数预测为18。我得出结论,这表明恒星的极限为150M(。);观测值与没有上限一致的概率为10(-8)。

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