文章基本信息

标题：New Variable Stars in NGC 6652 and Its Background Sagittarius Stream
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作者：Ricardo Salinas ; A. Katherina Vivas ; Rodrigo Contreras Ramos 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2019
卷号：157
期号：2
页码：1-8
DOI：10.3847/1538-3881/aaf796
语种：English
出版社：American Institute of Physics
摘要：We conducted a variable star search on the metal-rich Galactic globular cluster NGC 6652 using archival Gemini-S/Gemini Multiobject Spectrograph data. We report the discovery of nine new variable stars in the NGC 6652 field, of which we classify six as eclipsing binaries and one as an SX Phoenicis star, leaving two variables without classification. Using proper motions from Gaia DR2 and Hubble Space Telescope, albeit with some uncertainties, we find that the cluster, the field, and the background Sagittarius stream each have three of these variables. We also reassess the membership of known variables based on the Gaia proper motions, confirming the existence of one RR Lyrae star in the cluster.
关键词：galaxies: individual (Sgr dSph);globular clusters: individual (NGC 6652);stars: variables: delta Scuti;stars: variables: RR Lyrae