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J/AJ/126/2954       VI light curves of Sand 986 in M67       (Sandquist+, 2003)
S986 in M67: a totally eclipsing binary at the cluster turnoff.
    Sandquist E.L., Shetrone M.D.
   <Astron. J., 126, 2954-2962 (2003)>
   =2003AJ....126.2954S
ADC_Keywords: Binaries, eclipsing ; Photometry, CCD

Keywords: binaries: eclipsing - blue stragglers -
          open clusters and associations: individual (NGC 2682) -
          stars: individual (S986)

Abstract:
    We have discovered that the star S986 in the old open cluster M67 has
    detectable total eclipses of depth 0.08mag for the primary eclipse
    and 0.011mag for the secondary eclipse (in I only). We confirm the
    detection of a third star in spectra contributing (11.5±1.5)% of the
    total light in V band. The radial velocity of the third star indicates
    that it is a cluster member, but it is unclear whether it is
    physically associated with the eclipsing binary.

Description:
    All of the photometry for this study was taken at the 1-m telescope at
    the Mount Laguna Observatory using a 2048x2048 CCD on nights between
    2000 December and 2002 November.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    08 51 18.0   +11 45 54   S989 = Cl* NGC 2682 SAND 986
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        34     2148   V-Band Photometry of S986
table4.dat        34      793   I-Band Photometry of S986


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

   Bytes Format Units   Label   Explanations

   1- 12  F12.4 d       HJD     Heliocentric Julian Date of the observation
  14- 20  F7.4  mag     DVmag   The V band magnitude minus the median magnitude
  22- 27  F6.4  mag    e_DVmag  Error in DVmag
  29- 34  F6.4  ---     Phase   Orbital phase


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

   Bytes Format Units   Label   Explanations

   1- 12  F12.4 d       HJD     Heliocentric Julian Date of the observation
  14- 20  F7.4  mag     DImag   The I band magnitude minus the median magnitude
  22- 27  F6.4  mag    e_DImag  Error in DImag
  29- 34  F6.4  ---     Phase   Orbital phase


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    12-Jan-2004