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J/other/RMxAA/44.365   New variable stars in NGC 6366    (Arellano Ferro+, 2008)

A new search for variable stars in the globular cluster NGC 6366. Arellano Ferro A., Giridhar S., Rojas Lopez V., Figuera R., Bramich D.M., Rosenzweig P. <Rev. Mex. Astron. Astrofis., 44, 365 (2008)> =2008RMxAA..44..365A
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD Keywords: globular clusters: NGC 6366 - variable stars: RR Lyrae, SX Phe - eclipsing binaries Abstract: New CCD photometry of NGC 6366 has lead to the discovery of some variable stars. Two possible Anomalous Cepheids (or Pop II Cepheids), three long period variables, one SX Phe and one eclipsing binary have been found. Also a list of 10 candidate variables is reported. The light curve of the RRab star, V1, has been decomposed into its Fourier harmonics, and the Fourier parameters were used to estimate the star's metallicity and distance; [Fe/H]=-0.87±0.14 and d=3.2±0.1kpc. It is argued that V1 may not be a member of the cluster but rather a more distant object. If this is so, an upper limit for the distance to the cluster of 2.8±0.1kpc can be estimated. The P-L relationship for SX Phe stars and the identified modes in the newly discovered SX Phe variable, V6, allow yet another independent determination of the distance to the cluster of d=2.7±0.1kpc. The MV-[Fe/H] relationship for RR Lyrae stars is addressed and the case of V1 is discussed. Objects: ----------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------- 17 27 44.3 -05 04 36 NGC 6366 = C 1725-050 ----------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file objects.dat 62 18 List of objects rrlyrv1v.dat 26 61 Standard V magnitudes of RR Lyrae star V1 varr.dat 26 365 Instrumental r magnitudes of new variable stars varv.dat 26 359 Standard V magnitudes of new variable stars candr.dat 26 669 Instrumental r magnitudes of candidate to variable stars candv.dat 26 671 Standard V magnitudes of candidate to variable stars
Byte-by-byte Description of file: objects.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Table Variable (table1) or Candidate (table2) 11- 13 A3 --- Star Star name (V for Vriable, C for Candidate) 16- 27 A12 --- VFile File with the V light curve 29- 37 A9 --- rFile File with the r light curve 41- 45 F5.2 mag Vmag Mean V magnitude 47- 52 A6 --- Type Variability type 54- 62 F9.7 d Per ? Period
Byte-by-byte Description of file: *.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Star Variable (V1 to V8) or candidate (C1 to C11) number identification 5- 16 F12.4 d HJD Heliocentric Julian Date 19- 24 F6.3 mag mag Instrumental r or standard V magnitude 26 A1 --- Band [Vr] Photometric band for magnitude
Acknowledgements: A. Arellano Ferro, armando(at)astroscu.unam.mx
(End) A. Arellano Ferro [UNAM, Mexico], Patricia Vannier [CDS] 04-Sep-2008
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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