J/other/RMxAA/50.307  NGC 3201 RR Lyr stars light curves (Arellano Ferro+, 2014)
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Beginning of ReadMe : J/other/RMxAA/50.307 RR Lyr light curves in NGC 3201 (Arellano Ferro+, 2014) ================================================================================ Fourier decomposition of RR Lyrae light curves and the SX Phe population in the central region of NGC 3201. Arellano Ferro A., Ahumada J.A., Calderon J.H., Kains N. <Rev. Mex. Astron. Astrofis., 50, 307-322 (2014)> =2014RMxAA..50..307A ================================================================================ ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD Keywords: globular clusters: individual: NGC 3201 - stars: variables: RR Lyrae Abstract: CCD time-series observations of the central region of the globular cluster NGC 3201 were obtained with the aim of performing the Fourier decomposition of the light curves of the RR Lyrae stars present in that field. This procedure gave the mean values, for the metallicity, of [Fe/H]_ZW_=-1.483+/-0.006 (statistical) +/-0.090 (systematical), and for the distance, 5.000+/-0.001kpc (statistical) +/-0.220 (systematical). The values found from two RRc stars are consistent with those derived previously. The differential reddening of the cluster was investigated and individual reddenings for the RR Lyrae stars were estimated from their V-I curves. We found an average value of E(B-V)=0.23+/-0.02. An investigation of the light curves of stars in the blue stragglers region led to the discovery of three new SX Phe stars. The period-luminosity relation of the SX Phe stars was used for an independent determination of the distance to the cluster and of the individual reddenings. We found a distance of 5.0kpc Description: V and I time-series photometry for all confirmed variables in the central region of the golbular cluster NGC 3201.

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