帕洛马2球状星团中的RR天琴座恒星

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-08-16 DOI:10.22201/ia.01851101p.2023.59.01.01

A. Ferro, I. B. Fierro, S. Muneer, S. Giridhar

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引用次数: 1

摘要

利用CCD VI成像时间序列对帕洛玛2号星场的恒星光曲线进行了为期11年的观测。我们发现了20个RRab和1个RRc变量。对Gaia-DR3数据的修订使我们能够识别10多个变量，并确认其中6个变量的RRab性质和一个RGB。讨论了集群成员，其中18个变量是最有可能的集群成员。对星团成员星的11个最佳质量光曲线进行傅里叶光曲线分解，得到星团距离的独立估计为27.2±1.8 kpc和[Fe/H]ZW = -1.39±0.55。我们确认该群集为Oo I型。

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RR LYRAE STARS IN THE GLOBULAR CLUSTER PALOMAR 2

A CCD VI imaging time-series over 11-year is employed to explore the light curves of stars in the field of Palomar 2. We discovered 20 RRab and 1 RRc variables. A revision of Gaia-DR3 data enabled us to identify 10 more variables and confirm the RRab nature of 6 of them and one RGB. The cluster membership is discussed, and 18 variables are most likely cluster members. The Fourier light curve decomposition for the 11 best quality light curves of cluster member stars leads to independent estimates of the cluster distance 27.2 ± 1.8 kpc and [Fe/H]ZW = -1.39 ± 0.55. We confirm the cluster as of the Oo I type.

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来源期刊

Revista Mexicana de Astronomia y Astrofisica 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Revista Mexicana de Astronomía y Astrofísica, founded in 1974, publishes original research papers in all branches of astronomy, astrophysics and closely related fields. Two numbers per year are issued and are distributed free of charge to all institutions engaged in the fields covered by the RMxAA.