J/other/RMxAA/55.337 NGC 1261 variables VI light curves (Arellano Ferro+, 2019) ================================================================================ NGC 1261: a time-series VI study of its variable stars. Arellano Ferro A., Bustos Fierro I.H., Calderon J.H., Ahumada J.A. =2019RMxAA..55..337A (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD Keywords: globular clusters: individual: NGC 1261 - stars: variables: RR Lyrae - stars: fundamental parameters Abstract: Time-series VI CCD photometry of the globular cluster NGC 1261 is employed to study its variable star population. A membership analysis of most variables based on Gaia DR2 proper motions and colours was performed prior to the estimation of the mean cluster distance and metallicity. The light curves of the member RR Lyrae were Fourier decomposed to calculate their individual values of distance, [Fe/H], radius and mass. The I-band P-L for RR Lyrae stars was also employed. Our best estimates of the metallicity and distance of this Oo I cluster are [Fe/H]_ZW_=-1.42+/-0.05dex and d=17.2+/-0.4kpc. No mixture of fundamental and first overtone RR Lyrae stars in the either-or or bimodal region is seen in this cluster, as it seems to be the rule for Oo I clusters with a red horizontal branch. A multi-approach search in a region of about 10x10 arcmin^2^ around the cluster revealed no new variable stars within the limitations of our CCD photometry. Description: V and I time-series CCD photometry for known variables in the 5.4'x5.4' filed of view of NGC 1261. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table3.dat 101 29 *Data of variable stars in NGC 1261 in the FoV of our images table2.dat 50 16767 VI photometry of 24 RR Lyrae, SX Phe and SR variables in NGC 1261 -------------------------------------------------------------------------------- Note on table3.dat: Period of V2 corrected (from author). -------------------------------------------------------------------------------- See also: J/MNRAS/264/273 : CCD photometry of NGC 1261 (Ferraro+ 1993) J/A+A/516/A23 : UBVI Photometry of NGC 1261 (Kravtsov+, 2010) Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 A3 --- VName Variable name, VNN 5 A1 --- f_VName [1] 1: Star not resolved in our images 6- 7 A2 --- n_VName [Bl ] Bl: RR Lyrae with Blazhko effect 9- 14 A6 --- Type Variable type 16- 21 F6.3 mag ?=- Mean V magnitude 23- 28 F6.3 mag ?=- Mean I magnitude 30- 33 F4.2 mag AV ?=- Absorption in V band 35- 38 F4.2 mag AI ?=- Absorption in I band 40- 47 F8.6 d Per ?=- Period 49- 57 F9.4 d HJDmax ?=- Time of maximum (HJD-2450000) 59- 60 I2 h RAh Right ascension (J2000.0) 62- 63 I2 min RAm Right ascension (J2000.0) 65- 69 F5.2 s RAs Right ascension (J2000.0) 71 A1 --- DE- Declination sign (J2000.0) 72- 73 I2 deg DEd Declination (J2000.0) 75- 76 I2 arcmin DEm Declination (J2000.0) 78- 81 F4.1 arcsec DEs Declination (J2000.0) 83-101 I19 --- GaiaDR2 Gaia DR2 source number -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 2- 4 A3 --- VName Variable name, VNN 10 A1 --- Filter [VI] Observation filter 15- 27 F13.5 d HJD Heliocentric Julian date 30- 35 F6.3 mag magst Standard magnitude 38- 43 F6.3 mag maginst Instrumental magnitude 46- 50 F5.3 mag e_maginst Error on the magnitude -------------------------------------------------------------------------------- Acknowledgements: Armando Arellano Ferro, armando(at)astro.unam.mx ================================================================================ (End) Armando Arelano Ferro [IA-UNAM, Mexico] Patricia Vannier [CDS] 01-Oct-2019