光度问题：检验恒星形成理论
The Luminosity Problem: Testing Theories of Star Formation
摘要：
低质量原恒星的亮度比预期的要低。这个光度问题很重要，因为观测结果似乎与恒星形成理论的一些基本前提不一致。两种可能的解释是恒星形成缓慢，这是最近的数据所支持的，和/或原恒星吸积是偶发的;目前的数据表明，后者占不到一半的亮度缺失。光度问题的解决直接关系到形成低质量恒星所需时间的基本问题。原恒星的质量和光度函数为解决光度问题和检验恒星形成理论提供了强有力的工具。奇异等温球的崩溃，崩溃的湍流核心，竞争性吸积的结果。
英文摘要：
Low-mass protostars are less luminous than expected. This luminosity problem is important because the observations appear to be inconsistent with some of the basic premises of star formation theory. Two possible solutions are that stars form slowly, which is supported by recent data, and/or that protostellar accretion is episodic; current data suggest that the latter accounts for less than half the missing luminosity. The solution to the luminosity problem bears directly on the fundamental problem of the time required to form a low-mass star. The protostellar mass and luminosity functions provide powerful tools both for addressing the luminosity problem and for testing theories of star formation. Results are presented for the collapse of singular isothermal spheres, for the collapse of turbulent cores, and for competitive accretion.
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