RR LYRAE STARS IN THE GLOBULAR CLUSTER PALOMAR 2

被引：1
作者：
Arellano Ferro, A. [1 ]
Bustos Fierro, I. [2 ]
Muneer, S. [3 ]
Giridhar, S. [3 ]
机构：
[1] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico
[2] Univ Nacl Cordoba, Observ Astron, Cordoba, Argentina
[3] Indian Inst Astrophys, Bangalore, Karnataka, India
来源：
REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA | 2023年 / 59卷 / 01期
关键词：
globular clusters: individual: Pal 2; stars: variables: RR Lyrae; VARIABLE-STARS; CATALOG;
D O I：
10.22201/ia.01851101p.2023.59.01.01
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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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页码：3 / 10
页数：8
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