arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.01394astro-ph.SR
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来自LAMOST的RV变星候选星表

A Catalog of RV Variable Star Candidates from LAMOST

Zhijia Tian, Xiaowei Liu, Haibo Yuan, Xuan Fang, Bingqiu Chen, Maosheng Xiang, Yang Huang, Shaolan Bi, Wuming Yang, Yaqian Wu, Chun Wang, Huawei Zhang, Zhiying … 展开作者

Zhijia Tian, Xiaowei Liu, Haibo Yuan, Xuan Fang, Bingqiu Chen, Maosheng Xiang, Yang Huang, Shaolan Bi, Wuming Yang, Yaqian Wu, Chun Wang, Huawei Zhang, Zhiying Huo, Yong Yang, Gaochao Liu, Jincheng Guo, Meng Zhang

摘要:

RV型变星在天体物理学中占有重要地位。大天区多目标光纤光谱望远镜(LAMOST)光谱调查在其数据发布4(DR4)中提供了约650万个恒星光谱。在调查期间,有470万个独特的来源被锁定,100万颗恒星被重复观察。通过比较观测到的径向速度变化和模拟的径向速度变化,估计了恒星是RV变星的概率。通过分析LAMOST DR 4覆盖的重复观测多历元源,我们建立了一个包含80,702个概率大于0.60的RV变量候选者的目录。模拟和交叉鉴定表明,该目录的纯度高于80%。该星表包括77%的双星系统和7%的脉动星,以及16%的单星污染。通过与文献中发表的结果交叉识别,对3,138个RV变量进行了分类。通过使用LAMOST和一系列已发表的RV变量目录共有的3,138个源,我们能够分析LAMOST的RV变量检测率。在这项工作中所采用的方法的效率不仅依赖于采样频率的观测,但RV变量的周期和振幅。随着LAMOST、Gaia等观测的进展,将有越来越多的RV变量被确认和分类。该星表对其他大规模调查,特别是RV变量搜索很有价值。该目录将根据LAMOST数据政策通过http://dr4.lamost.org发布。

英文摘要:

RV variable stars are important in astrophysics. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic survey has provided ~ 6.5 million stellar spectra in its Data Release 4 (DR4). During the survey, ~ 4.7 million unique sources were targeted and ~ 1 million stars observed repeatedly. The probabilities of stars being RV variables are estimated by comparing the observed radial velocity variations with the simulated ones. We build a catalog of 80,702 RV variable candidates with probability greater than 0.60 by analyzing the duplicate-observed multi-epoch sources covered by the LAMOST DR4. Simulations and cross-identifications show that the purity of the catalog is higher than 80%. The catalog consists of 77% binary systems and 7% pulsating stars as well as 16% pollution by single stars. 3,138 RV variables are classified through cross-identifications with published results in literatures. By using the 3,138 sources common to both LAMOST and a collection of published RV variable catalogs we are able to analyze LAMOST's RV variable detection rate. The efficiency of the method adopted in this work relies not only on the sampling frequency of observations but also periods and amplitudes of RV variables. With the progress of LAMOST, Gaia and other surveys, more and more RV variables would will be confirmed and classified. This catalog is valuable for other large-scale surveys, especially for RV variable searches. The catalog will be released according to the LAMOST Data Policy via http://dr4.lamost.org.

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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