Variable stars in Palomar 13; an evaporating globular cluster

被引：8
作者：
Yepez, M. A. [1 ]
Arellano Ferro, A. [1 ]
Schroder, K. P. [2 ]
Muneer, S. [3 ]
Giridhar, Sunetra [3 ]
Allen, Christine [1 ]
机构：
[1] Univ Nacl Autonoma Mexico, Inst Astron, Ciudad Univ, Mexico City 04510, DF, Mexico
[2] Univ Guanajuato, Dept Astron, Guanajuato, Mexico
[3] Indian Inst Astrophys, Bangalore, Karnataka, India
来源：
NEW ASTRONOMY | 2019年 / 71卷
关键词：
Globular clusters; Individual (Pal 13) - stars; Variables; RR Lyrae; RR LYRAE STARS; PERIOD CHANGES; PHOTOMETRY; EVOLUTION; SYSTEM; PARAMETERS; VELOCITY; CATALOG; COLORS; FIELD;
D O I：
10.1016/j.newast.2019.02.006
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present new CCD VI photometry of the distant globular cluster Pal 13. Fourier decomposition of the light curves of the three cluster member RRab stars lead to estimations of [Fe/H] = - 1.65, and a distance of 23.67 +/- 0.57 kpc. Light and colour near minimum phases for RRab stars leads to an estimate of E(B - V) = 0.104 +/- 0.001. A V/(V - I) colour-magnitude diagram, built exclusively with likely star members, shows consistency with the above parameters and an age of 12 Gyrs. A search of variable stars in the field of view of our images revealed the variability of a red giant cluster member and of three probably non-member stars; two RRab stars and one W Virginis star or CW. The GAIA proper motions of member stars in Pal 13 show a significant scatter, consistent with the scenario of the cluster being tidally stripped.
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页码：1 / 11
页数：11
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