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arXiv 1407.7609astro-ph.SRastro-ph.GA
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共同自行F/G/K +M宽间隔双星的光学BVRI测光

Optical BVRI Photometry of Common Proper Motion F/G/K+M Wide Separation Binaries

Ting Li, J. L. Marshall, Sebastien Lepine, Patrick Williams, Joy Chavez

摘要:

我们提出了光学(BVRI)光度测量的样本76个常见的自行宽分离主序星对。双星对由一颗F-、G-或K-型主星和一颗M-型伴星组成。样品选自修订的NLTT星表和LSPM星表。光度测量一般在所有波段精确到0.03等。我们把我们的样本分为两组,矮候选人和亚矮候选人,使用我们的改进测光构造的约化自行(RPM)图。在给定的$V-I$颜色下,M个亚矮星候选者通常具有比M个矮星候选者更大的$V-R$颜色。这与PHOENIX/BT-Settl模型预测的两组之间的平均金属丰度差异一致。改进后的光度测定法将用于确定M型恒星金属丰度的技术。

英文摘要:

We present optical (BVRI) photometric measurements of a sample of 76 common proper motion wide separation main sequence binary pairs. The pairs are composed of a F-, G-, or K-type primary star and an M-type secondary. The sample is selected from the revised NLTT catalog and the LSPM catalog. The photometry is generally precise to 0.03 mag in all bands. We separate our sample into two groups, dwarf candidates and subdwarf candidates, using the reduced proper motion (RPM) diagram constructed with our improved photometry. The M subdwarf candidates in general have larger $V-R$ colors than the M dwarf candidates at a given $V-I$ color. This is consistent with an average metallicity difference between the two groups, as predicted by the PHOENIX/BT-Settl models. The improved photometry will be used as input into a technique to determine the metallicities of the M-type stars.

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