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arXiv 1003.3656astro-ph.GAastro-ph.SR
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低振幅变星:区分RR天琴座星和双星

Low-Amplitude Variables: Distinguishing RR Lyrae stars from Eclipsing Binaries

T. D. Kinman, Warren R. Brown

摘要:

识别和分类低幅度变量并不容易,但重要的是要正确地进行分类。我们使用光度学和光谱学对阿克洛夫等人(2002年)在246 ° ^2范围内的低振幅变星进行分类。阿克洛夫及其合作者发现,在他们2000 deg^2的测试视场中,38%的天琴座RR型恒星是RR 1(c型)。这表明这些RR型天琴座星属于奥斯特霍夫II型星群,而它们的周期分布主要是奥斯特霍夫I型。我们的观测结果支持他们的RR 0(ab型)分类,但是他们分类为RR 1(c型)的7颗恒星中有6颗是食双星。我们的分类支持光谱金属丰度,线加宽和银河系旋转测量。我们的246 deg^2视场包含16颗亮于m_R = 14.5的RR型天琴座星,其中只有4颗是RR 1(c型)。这对应于Oosterhoff I型人口与周期分布一致。

英文摘要:

It is not easy to identify and classify low-amplitude variables, but it is important that the classification is done correctly. We use photometry and spectroscopy to classify low-amplitude variables in a 246 deg^2 part of the Akerlof et al. (2002) field. Akerlof and collaborators found that 38% of the RR Lyrae stars in their 2000 deg^2 test field were RR1 (type c). This suggests that these RR Lyrae stars belong to an Oosterhoff Type II population while their period distribution is primarily Oosterhoff Type I. Our observations support their RR0 (type ab) classifications, however 6 of the 7 stars that they classified as RR1 (type c) are eclipsing binaries. Our classifications are supported by spectroscopic metallicities, line-broadening and Galactic rotation measurements. Our 246 deg^2 field contains 16 RR Lyrae stars that are brighter than m_R = 14.5; only four of these are RR1 (type c). This corresponds to an Oosterhoff Type I population in agreement with the period distribution.

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