Variable stars in Palomar 13; an evaporating globular cluster
| Autor: | M. A. Yepez, A. Arellano Ferro, Sunetra Giridhar, S. Muneer, K.P. Schröder, Christine Allen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
010308 nuclear & particles physics Red giant FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics RR Lyrae variable Light curve Astrophysics - Astrophysics of Galaxies 01 natural sciences Photometry (optics) Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Globular cluster 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Variable star 010303 astronomy & astrophysics Instrumentation Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics |
| Zdroj: | New Astronomy. 71:1-11 |
| ISSN: | 1384-1076 |
| DOI: | 10.1016/j.newast.2019.02.006 |
| Popis: | 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$\pm$0.57 kpc. Light and colour near minimum phases for RRab stars leads to an estimate of $E(B-V)$=0.104 $\pm$ 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. 13 pages, 5 Tables, 14 Figures, Accepted by New Astronomy Feb 19, 2019 |
| Databáze: | OpenAIRE |
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