低质量IMF中的不连续性--高多重性的情况
A discontinuity in the low-mass IMF - the case of high multiplicity
摘要：
棕矮星（BD）的经验双星性质与正常恒星不同，这表明BD形成了一个独立的种群。Thies和Kroupa最近的工作揭示了在极低质量恒星体系中，在BD的多重性较低（约为15%）的假设下，初始质量函数（IMF）的不连续性。然而，以前的观测表明BD的多重性可能要高得多，高达45%。这一贡献调查的含义高BD多重性的外观IMF的猎户座星云星团，金牛座御夫座，IC 348和Pleiades。我们表明，即使观察到的MF似乎是连续的，即使是高达60%的BD二进制分数的不连续性仍然明显。我们没有发现任何证据的BD IMF与恒星形成条件的变化。BD IMF的幂律指数α = +0.3，假设BD的质量相等，每10颗低质量恒星中大约有2个BD。
英文摘要：
The empirical binary properties of brown dwarfs (BDs) differ from those of normal stars suggesting BDs form a separate population. Recent work by Thies & Kroupa revealed a discontinuity of the initial mass function (IMF) in the very-low-mass star regime under the assumption of a low multiplicity of BDs of about 15 per cent. However, previous observations had suggested that the multiplicity of BDs may be significantly higher, up to 45 per cent. This contribution investigates the implication of a high BD multiplicity on the appearance of the IMF for the Orion Nebula Cluster, Taurus-Auriga, IC 348 and the Pleiades. We show that the discontinuity remains pronounced even if the observed MF appears to be continuous, even for a BD binary fraction as high as 60%. We find no evidence for a variation of the BD IMF with star-forming conditions. The BD IMF has a power-law index alpha = +0.3 and about two BDs form per 10 low-mass stars assuming equal-mass pairing of BDs.
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