J/AJ/129/2663 B photometry of M31 variable star candidates (Williams+, 2005) ================================================================================ Variable star candidates in an advanced camera for surveys field of M31. Williams B.F. =2005AJ....129.2663W ================================================================================ ADC_Keywords: Stars, variable ; Photometry, HST Keywords: galaxies: individual (M31) - galaxies: stellar content - stars: variables: other Abstract: A search for variable stars is performed using two epochs of Hubble Space Telescope Advanced Camera for Surveys imaging data for a 9.28arcmin^2^ portion of M31. This data set reveals 254 sources that vary by at least 4{sigma} between epochs. The positions and two-epoch B-band (equivalent) photometry of these sources are presented. Description: The data used for this project were originally obtained as part of a program to find the optical counterparts for X-ray novae in M31 (Williams et al. 2005ApJ...620..723W). I obtained two sets of HST ACS data, one observed at UT 21:35 on 2003 December 3 and one observed at UT 16:38 on 2004 March 1. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 77 254 Variable stars in the ACS field -------------------------------------------------------------------------------- See also: J/A+A/402/113 : (RI)c photometry of variables in M31 (Joshi+, 2003) J/A+A/421/509 : AGAPE catalogue of M31 variables (Ansari+, 2004) J/ApJS/154/623 : M31 Long Period Variables : Photometry (Mould+, 2004) J/MNRAS/351/1071 : POINT-AGAPE Survey. M31 variables (An+, 2004) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 16 A16 --- M31ACSV The M31ACSV name (JHHMMSS.s+DDMMSS) 18 I1 h RAh Hour of Right Ascension (J2000) 20- 21 I2 min RAm Minute of Right Ascension (J2000) 23- 28 F6.3 s RAs Second of Right Ascension (J2000) 29 A1 --- DE- Sign of the Declination (J2000) 30- 31 I2 deg DEd Degree of Declination (J2000) 33- 34 I2 arcmin DEm Arcminute of Declination (J2000) 36- 40 F5.2 arcsec DEs Arcsecond of Declination (J2000) 42 A1 --- l_B1mag Limit flag on B1mag 43- 47 F5.2 mag B1mag HST 03 Dec 2003 F435W filter VEGAMAG magnitude 49- 52 F4.2 mag e_B1mag ? Uncertainty in B1mag 54 A1 --- l_B2mag Limit flag on B2mag 55- 59 F5.2 mag B2mag HST 01 Mar 2004 F435W filter VEGAMAG magnitude 61- 64 F4.2 mag e_B2mag ? Uncertainty in B2mag 66 A1 --- l_B1-B2 Limit flag on B1-B2 67- 71 F5.2 mag B1-B2 The (B1mag - B2mag) brightness change 73- 76 F4.2 mag e_B1-B2 ? Uncertainty in B1-B2 -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Marianne Brouty [CDS] 10-Oct-2005