# A new study of the variable star population in the Hercules globular cluster (M13; NGC 6205)★

@article{Deras2019ANS,
title={A new study of the variable star population in the Hercules globular cluster (M13; NGC 6205)★},
author={D Deras and Armando Arellano Ferro and C. L'azaro and I. H. Bustos Fierro and J. H. Calder'on and S. Muneer and Sunetra Giridhar},
journal={Monthly Notices of the Royal Astronomical Society},
year={2019}
}
• Published 4 March 2019
• Physics
• Monthly Notices of the Royal Astronomical Society
We present the results from $VI$ CCD time-series photometry of the globular cluster M13 (NGC 6205). From the Fourier decomposition of the light curves of RRab and RRc stars we found an average metallicity of [Fe/H]zw = -1.58 $\pm$ 0.09. The distance to the cluster was estimated as 7.1 $\pm$ 0.1 kpc from independent methods related to the variable star families RR Lyrae, SX Phe and W Virginis, from the luminosity of the theoretical ZAHB and from the orbit solution of a newly discovered contact…

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