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Title: Variable stars in Palomar 13; an evaporating globular cluster
Authors: Yepez, M. A
Ferro, A. A
Schoeder, K. P
Muneer, S
Giridhar, S
Allen, C
Keywords: Globular clusters;Individual (Pal 13) – stars;Variables;RR Lyrae
Issue Date: Aug-2019
Publisher: Elsevier B.V
Citation: New Astronomy, Vol. 71, pp. 1-11
Abstract: 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; twoRRab 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.
Description: Restricted Access
ISSN: 1384-1076
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Appears in Collections:IIAP Publications

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