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arXiv 0903.0868astro-ph.SRcond-mat.stat-mech
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主序星场星的非高斯统计和恒星自转速度

Non-gaussian statistics and stellar rotational velocities of main sequence field stars

J. C. Carvalho, J. D. Jr. do Nascimento, R. Silva, J. R. De Medeiros

摘要:

在这封信中,我们研究了在超过16,000颗附近的F和G矮星样本中观测到的旋转速度分布,这些恒星的星等完整,并提供了高精度的$Vsin i$测量。我们表明,速度分布不能由麦克斯韦拟合。另一方面,基于Tsallis和Kaniadakis幂律统计的分析是迄今为止最合适的统计,并给出了非常好的拟合。它还表明,单星和双星有类似的旋转分布。据我们所知,这是第一次对这两个新的统计量进行测试,以用于如此大的恒星样本的旋转,从而有力地解决了关于恒星旋转速度分布函数的令人困惑的问题

英文摘要:

In this letter we study the observed distributions of rotational velocity in a sample of more than 16,000 nearby F and G dwarf stars, magnitude complete and presenting high precision $Vsin i$ measurements. We show that the velocity distributions cannot be fitted by a maxwellian. On the other hand, an analysis based on both Tsallis and Kaniadakis power-law statistics is by far the most appropriate statistics and give a very good fit. It is also shown that single and binary stars have similar rotational distributions. This is the first time, to our knowledge, that these two new statistics are tested for the rotation of such a large sample of stars, pointing solidly to a solution of the puzzling problem on the function governing the distribution of stellar rotational velocity

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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