A Renaissance study of Am stars I. The mass ratio distribution

A Renaissance study of Am stars I. The mass ratio distribution
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Am 恒星的文艺复兴研究 I. 质量比分布

DOI:
10.1051/0004-6361/201015529
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发表时间:
2010
影响因子:
6.5
通讯作者:
H. Boffin
H. Boffin
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
H. Boffin

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目标。由Carquillat & Prieur(2007,MNRAS,380,1064)对Am双星的研究引发,我重新分析了他们的60个轨道样本,以推导出质量比分布(MRD),假设他们做了先验函数形式,即幂律或高斯。然后,使用几个团体发布的轨道扩展样本,并对MRD进行全面分析,而不对函数形式进行任何假设。方法.我推导出的MRD使用Richardson-Lucy反演方法,假设一个固定的质量的上午主要和随机分布的轨道倾角。使用大的子样本双线光谱双星,我表明,这种方法确实是完全足够的。结果我首先推导出Carquillat & Prieur样本的函数形式的新参数。使用反演方法,适用于我的扩展样本的162个系统,我发现,最终的MRD可以近似由均匀分布。
Aims. Triggered by the study of Carquillat & Prieur (2007, MNRAS, 380, 1064) of Am binaries, I reanalyse their sample of 60 orbits to derive the mass ratio distribution (MRD), assuming as they did a priori functional forms, i.e. a power law or a Gaussian. The sample is then extended using orbits published by several groups and a full analysis of the MRD is made, without any assumption on the functional form. Methods. I derive the MRD using a Richardson-Lucy inversion method, assuming a fixed mass of the Am primary and randomly distributed orbital inclinations. Using the large sub-sample of double-lined spectroscopic binaries, I show that this methodology is indeed perfectly adequate. Results. I first derive new parameters of the functional form for the Carquillat & Prieur sample. Using the inversion method, applied to my extended sample of 162 systems, I find that the final MRD can be approximated by a uniform distribution.