/ftp/cats/J_other/RMxAA/40.209



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J/other/RMxAA/40.209   NGC 4147 VR light curves of 15 RR Lyrae (Arellano+, 2004)
The following files can be converted to FITS (extension .fit or fit.gz)
	table3.dat varphot.dat
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Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/other/RMxAA/40.209
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Beginning of ReadMe : J/other/RMxAA/40.209 VR light curves of 15 RR Lyrae in NGC 4147 (Arellano+ 2004) ================================================================================ CCD photometry of the RR Lyrae stars in NGC 4147. Arellano Ferro A., Arevalo M.J., Lazaro C., Rey M., Bramich D.M., Giridhar S. <Rev. Mex. Astron. Astrofis., 40, 209-221 (2004)> =2004RMxAA..40..209A ================================================================================ ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD Keywords: globular clusters: NGC 4147 - stars: variables: RR Lyrae Abstract: We report the results of CCD V and R photometry of the RR Lyrae stars known in NGC 4147. The periodicities of most variables are revised and new ephemerides are calculated. The Blazhko effect has been detected in V2 and V6. Three previously reported variables; V5, V9, and V15 are found to be non-variable. A new variable V18 was discovered with a period of 0.49205-days and an amplitude of 0.15mag. Using the approach of Fourier decomposition of the light curves, the physical parameters of the RRab and RRc variables were estimated. The cluster is of the Oosterhoff type I. With the newly values [Fe/H]=-1.22+/-0.31 and 16.8+/-1.3kpc, the cluster fits very well into the Oosterhoff type-metallicity and metallicity-temperature sequence found in globular clusters. A comparison with ZAHB models indicates that the RRab stars have not yet evolved off the horizontal branch, a result consistent with the mean period of the RRab variables and with the metallicity of the cluster derived in this work. Description: Time-series V and R photometry for the variable stars in NGC4147.

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