J/other/RMxAA/42.75  CCD RV light curve of M15 RR Lyrae  (Arellano Ferro+, 2006)
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	table1.dat table2.dat table4.dat
Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/other/RMxAA/42.75

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Beginning of ReadMe : J/other/RMxAA/42.75 CCD RV light curve of M15 RR Lyrae (Arellano Ferro+, 2006) ================================================================================ CCD Photometry of the Globular Cluster M15: RR Lyrae Fourier Decomposition and Physical Parameters. Arellano Ferro A., Garcia Lugo G., Rosenzweig P. <Rev. Mex. Astron. Astrofis., 42, 75-87 (2006)> =2006RMxAA..42...75A ================================================================================ ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD Keywords: globular clusters (M15) - Stars: variables: RR Lyrae - stars: horizontal branch Abstract: Results of CCD photometry using V and R filters are reported for 33 RR Lyrae stars in M15. Applying the approach of Fourier decomposition of the light curves, the physical parameters of the type RRab and RRc variables were estimated. The cluster is Oosterhoff type II and the values for the iron content and distance are: [Fe/H]=-1.98+/-0.24 and d=8.67+/-0.41kpc, respectively. The mean values of the physical parameters determined for the RR Lyrae stars place the cluster precisely into the sequences Oosterhoff type - metallicity and metallicity - effective temperature, valid for globular clusters. Evidences of evolution from the ZAHB are found for the RRc but not for the RRab stars. Description: V and R images were obtained in 2000 and 2001, using the 1.5m telescope of San Pedro Martit Observatory (SPM), in Baja California, Mexico. A total of 129 and 127 images in the V and R filters, respectively, were obtained during both seasons and distributed in two fields of the cluster. The instrumental magnitudes were obtained using the PSF function, calculated for each frame from relatively isolated and well exposed stars, in the field of the cluster. The transformation to the standard system was performed differentially, relative to a group of standard stars in the observed fields of M15. The accuracy of the photometry is estimated as +/-0.031 and +/-0.019 for the V and R filters respectively. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 21 29 58.4 +12 10 01 M15 = NGC 7078 ----------------------------------------------------------

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