The Globular Cluster NGC 5286: Color-Magnitude Diagram and Variable Stars

Details The Globular Cluster NGC 5286: Color-Magnitude Diagram and Variable Stars The Globular Cluster NGC 5286: Color-Magnitude Diagram and Variable Stars

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35..308z&link_type=abstract

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Scientific paper

We present BV photometry of the globular cluster NGC 5286. The CMD was decontaminated and several HB and RGB parameters were calculated, finding a metallicity of [Fe/H] = -1.69+/-0.07. We also present the result of the search of variable stars. 56 variable stars were detected, 51 RR Lyrae (22 RRc and 29 RRab), 4 LPV's and 1 Type II cepheid (BL Herculis). 17 of the RR Lyrae are previously known. The mean period of the RRab variables is P_{ab}=0.654 days, and the number fraction of RRc stars is N_C/N_RR=0.43, suggesting that NGC 5286 is an Oosterhoff type II (OoII) globular cluster. The physical parameters of the RRc and RRab variables were obtained from Fourier decomposition of their light curves, revealing a value for the metallicity of [Fe/H] = -1.675+/-0.053.

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