The Impact of Binaries on the Stellar Initial Mass Function

The Impact of Binaries on the Stellar Initial Mass Function
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双星对恒星初始质量函数的影响

DOI:
10.1017/9781108553070.017
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发表时间:
2018
期刊:
The Impact of Binary Stars on Stellar Evolution
影响因子:
--
通讯作者:
T. Jeřábková
T. Jeřábková
中科院分区:
--
文献类型:
--
作者:
P. Kroupa;T. Jeřábková

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恒星初始质量函数(IMF)可以方便地表示为一个正则的两部分幂律函数,并且对于本星系群中明显的星星形成区域基本上是不变的。国际货币基金组织是一个hilfskonstrukt。这是一个数学公式的理想人口的恒星形成一起在一个星星形成事件。IMF的性质(它是概率密度还是最优抽样分布函数?)是提高的。双星,如果没有解决,在低恒星质量有非常显着的影响。特别重要的是要照顾到不断变化的二进制分数的结果,恒星动力学演化的嵌入式集群产生的领域人口的星系,鉴于二进制分数在出生时是非常高的,独立于主恒星的质量。大质量恒星之间的高多重性分数导致这些恒星中的很大一部分被抛出它们的诞生星团,并导致大质量恒星合并。这解释了M31中星星团中IMF顶部的亮度。在密近双星中,由于质量转移,组分的质量也会改变。大量的证据表明,随着金属丰度的降低,当星团形成云核的恒星形成率密度超过0.1 Msun/(pc^3 yr)时,IMF会变得头重脚轻。这一点也可以通过观测到的恒星爆发星系中的超新星发生率来表明。与此同时,IMF在低金属丰度时可能是底部轻的,而在高金属丰度时可能是底部重的,这可能分别解释了椭圆星系和超暗矮星系的结果。
(abridged) The stellar initial mass function (IMF) can be conveniently represented as a canonical two-part power law function and is largely invariant for star formation regions evident in the Local Group of galaxies. The IMF is a hilfskonstrukt. It is a mathematical formulation of an idealised population of stars formed together in one star formation event. The nature of the IMF (is it a probability density or an optimal sampling distribution function?) is raised. Binary stars, if unresolved, have a very significant influence at low stellar masses. Especially important is to take care of the changing binary fraction as a result of stellar-dynamical evolution of the embedded clusters which spawn the field populations of galaxies, given that the binary fraction at birth is very high and independent of primary-star mass. The high multiplicity fraction amongst massive stars leads to a substantial fraction of these being ejected out of their birth clusters and to massive stars merging. This explains the top-lightness of the IMF in star clusters in M31. In close binaries also the masses of the components can be changed due to mass transfer. A large amount of evidence points to the IMF becoming top-heavy with decreasing metallicity and above a star-formation-rate density of about 0.1 Msun/(pc^3 yr) of the cluster-forming cloud core. This is also indicated through the observed supernova rates in star-bursting galaxies. At the same time, the IMF may be bottom light at low metallicity and bottom-heavy at high metallicity, possibly accounting for the results on elliptical galaxies and ultra-faint dwarf galaxies, respectively.
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