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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.
   <Astron. J., 129, 2663-2669 (2005)>
   =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
    9.28arcmin2 portion of M31. This data set reveals 254 sources that
    vary by at least 4σ 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