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J/A+A/459/321       BV photometry of M31 eclipsing binaries  (Vilardell+, 2006)
Eclipsing binaries suitable for distance determination in the Andromeda galaxy.
    Vilardell F., Ribas I., Jordi C.
   <Astron. Astrophys. 459, 321 (2006)>
   =2006A&A...459..321V
ADC_Keywords: Stars, variable ; Binaries, eclipsing ; Photometry, UBV

Keywords: stars: variables: general - stars: binaries: eclipsing -
          stars: fundamental parameters - stars: distances -
          techniques: photometric - catalogs

Abstract:
    Broad band photometry (in Johnson B and V) has been obtained in a
    region (34'x34') at the North-Eastern quadrant of M31 over 5 years
    (1999-2003) at the Isaac Newton Telescope (La Palma, Spain). The data,
    containing more than 250 observations per filter, have been reduced by
    means of the so-called difference image analysis technique and the
    DAOPHOT program. A catalog with 236238 objects with photometry in both
    B and V passbands has been obtained. The catalog is the deepest
    (V<25.5mag) obtained so far in the studied region and contains 3964
    identified variable stars, with 437 eclipsing binaries and 416
    Cepheids.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       157   236238   List of all stars
table4.dat       106     3964   List of variable stars
table5a/*         28     3964   V light curves for all the variable stars
table5b/*         28     3964   B light curves for all the variable stars


See also:
 J/AJ/115/1894    : DIRECT M31A eclipsing binaries & Cepheids (Stanek+ 1998)
 J/AJ/115/1016    : DIRECT M31B eclipsing binaries & Cepheids (Kaluzny+ 1998)
 J/AJ/117/2810    : DIRECT M31C eclipsing binaries & Cepheids (Stanek+, 1999)
 J/AJ/118/346     : DIRECT M31D eclipsing binaries & Cepheids (Kaluzny+ 1999)
 J/AJ/118/2211    : DIRECT M31F eclipsing binaries & Cepheids (Mochejska+ 1999)
 J/A+A/421/509    : AGAPE catalogue of M31 variables (Ansari+, 2004)
 J/MNRAS/351/1071 : POINT-AGAPE Survey. M31 variables (An+, 2004)
 J/AJ/129/2663    : B phot. of M31 variable star candidates (Williams+, 2005)
 J/AJ/131/2478    : Local Group Galaxies Survey (LGGS) (Massey+, 2006)


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1- 22  A22   ---     Name      Object identifier
  24- 31  F8.5  deg     RAdeg     Right Ascension J2000 (degrees)
  33- 40  F8.5  deg     DEdeg     Declination J2000 (degrees)
  42- 47  F6.3  mag     Vmag      Johnson V standard magnitude
  49- 53  F5.3  mag     e_Vmag    V standard error
  55- 60  F6.3  mag     Bmag      Johnson B standard magnitude
  62- 66  F5.3  mag     e_Bmag    B standard error
  68-157  A90   ---     ONames    Identifier in GSC, DIRECT or LGGS (Massey et
                                   al., 2006AJ....131.2478M)


Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label    Explanations

   1-  5  A5    ---     ---      [M31V_]
   6- 22  A17   ---     Name    *Object identifier
  24- 31  F8.5  deg     RAdeg    Right Ascension J2000 (degrees)
  33- 40  F8.5  deg     DEdeg    Declination J2000 (degrees)
  42- 47  F6.3  mag     Vmag     Mean Johnson V standard magnitude
  49- 53  F5.3  mag     e_Vmag   Mean V standard error
  55- 60  F6.3  mag     Bmag     Mean Johnson B standard magnitude
  62- 66  F5.3  mag     e_Bmag   Mean B standard error
  68- 70  I3    ---     o_Vmag   Number of observations in V
  72- 74  I3    ---     o_Bmag   Number of observations in B
  76- 87  F12.4 d       RefHJD   Reference time (Heliocentric Julian days)
  89- 98  F10.6 d       Period   Period (days)
 100-106  A7    ---     VType    Variable type: CEPHEID or EB (eclipsing binary)

Note on Name:
  File names in tables 5a and 5b have been generated from this field.


Byte-by-byte Description of file: table5a/* table5b/*

   Bytes Format Units   Label     Explanations

   1- 12  F12.4 d       HJD       Time of observation (Julian days)
  14- 19  F6.3  mag     mag       Johnson V (table5a) or B (table5b)
                                   standard magnitude
  21- 28  F8.3  mag     e_mag     Magnitude standard error


Acknowledgements: Francesc Vilardell, fvilarde(at)am.ub.es

(End)                                        Patricia Vannier [CDS]  11-Jul-2006