======================================================================= OGLE Study of the Sagittarius Dwarf Spheroidal Galaxy and its M54 Globular Cluster A. Hamanowicz, P. Pietrukowicz, A. Udalski, P. Mroz, I. Soszynski, M.K. Szymanski, J. Skowron, R. Poleski, L. Wyrzykowski, S. Kozlowski, M. Pawlak, and K. Ulaczyk ======================================================================= ahamanowicz@astrouw.edu.pl pietruk@astrouw.edu.pl udalski@astrouw.edu.pl This directory contains details on detected variables in the globular cluster M54 (NGC 6715) residing in the core of the Sgr dSph galaxy. The directory structure is as follows: README - this file M54variables.dat - list of variable stars in M54 phot/I/ - I-band photometry of individual variables phot/V/ - V-band photometry of individual variables phot.tar.gz - gzipped phot/ directory fcharts/ - finding charts of individual variables remarks.txt - remarks on selected objects pap.pdf - PDF version of the publication Format of the file M54variables.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 4 A4 --- Variable's ID 7- 10 A4 --- HST variable candidate's ID (Montiel & Mighell 2010) 13- 14 I2 h Right ascension, equinox J2000.0 (hours) 16- 17 I2 m Right ascension, equinox J2000.0 (minutes) 18- 22 F5.2 s Right ascension, equinox J2000.0 (seconds) 25 A1 --- Declination, equinox J2000.0 (sign) 26- 27 I2 deg Declination, equinox J2000.0 (degrees) 29- 30 I2 arcmin Declination, equinox J2000.0 (arc minutes) 32- 35 F4.1 arcsec Declination, equinox J2000.0 (arc seconds) 39- 44 F6.3 arcmin Distance from the center of the cluster 47- 53 F7.3 r_c Distance from the center in units of M54 core radius 56- 61 F6.3 r_h Distance from the center in units of M54 half-light radius 64- 68 F5.3 r_t Distance from the center in units of M54 tidal radius 71- 90 A20 --- OGLE-BLG-RRLYR-ID (Soszynski et al. 2014) 93-107 A15 --- OGLE-IV ID 110-121 F12.8 d Period 124-134 F10.8 d Period uncertainty 136-140 I5 --- OGLE-IV ID in the V band 147-153 A7 --- Variability type 155-160 F6.3 mag Mean V-band brightness 163-168 F6.3 mag Maximum V-band brightness 171-176 F6.3 mag Minimum V-band brightness 179-184 F6.3 mag Mean I-band brightness 187-192 F6.3 mag Maximum I-band brightness 195-200 F6.3 mag Minimum I-band brightness 203-207 F5.3 mag I-band amplitude 210-260 A --- Remarks -------------------------------------------------------------------------- Finding charts are gzipped Postscript images. The finding charts are 30"x30" subframes of the I-band reference frames centered on the star. White cross marks the star. North is up and East to the left. Some stars in the center of the cluster are hardly visible due to crowding. Any presentation of the scientific analysis or usage of the data from the OGLE collection of variable stars should include appropriate references to OGLE papers.