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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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 51 18 Update of periods, epochs, and amplitudes for the RR Lyrae stars in NGC 4147 varphot.dat 24 4336 CCD time-series V and R photometry of 15 variables in NGC 4147
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Vno Variable name (VNN), Cl* NGC 4147 SAW VNN in Simbad 5- 6 A2 --- Type [ab c] Type of RR Lyrae variable 8- 15 F8.6 d OPer ? Old period 16 A1 --- u_OPer Uncertainty flag on OPer 17- 19 A3 --- n_OPer [pnv] "pnv" for "probably not variable" 21- 27 F7.5 d Per ? New Period 28- 29 A2 --- n_Per [nv] "nv" for "not variable" 31- 39 F9.3 d T0 ? Epoch of maximum light (JD-2400000) 41- 44 F4.2 mag Vamp ? Amplitude in V band 45 A1 --- n_Vamp [a] Blazhko effect (1) 47- 50 F4.2 mag Ramp ? Amplitude in R band 51 A1 --- n_Ramp [a] Blazhko effect (1)
Note (1): a: Maximum amplitude but there is evidence of Blazhko effect.
Byte-by-byte Description of file: varphot.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Vno Variable name (VNN) 5 A1 --- Filter [VR] Observation filter 7- 17 F11.3 d HJD Heliocentric Julian date at mid-exposure 19- 24 F6.3 mag magst Standard magnitude in Filter
Acknowledgements: Daniel Bramich, dbramich(at)eso.org
(End) Daniel Bramich [ESO, Germany], Patricia Vannier [CDS] 28-Jan-2013
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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