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J/AJ/123/3460       Low-amplitude variables in NGC 6791      (Mochejska+, 2002)
Planets in stellar clusters extensive search.
I. Discovery of 47 low-amplitude variables in the metal-rich cluster NGC 6791
with millimagnitude image subtraction photometry.
     Mochejska B.J., Stanek K.Z., Sasselov D.D., Szentgyorgyi A.H.
    <Astron. J. 123, 3460 (2002)>
    =2002AJ....123.3460M
ADC_Keywords: Stars, variable ; Binaries, eclipsing ; Photometry

Keywords: binaries: eclipsing - color-magnitude diagrams -
          novae, cataclysmic variables - stars: variables: other

Abstract:
    We have undertaken a long-term project, the Planets in Stellar
    Clusters Extensive Search (PISCES), to search for transiting planets
    in open clusters. As our first target, we have chosen NGC 6791, a very
    old, populous, metal-rich cluster. We present the results of a test
    observing run at the F.L. Whipple Observatory's 1.2 m telescope, from
    2001 July 6 to August 1. Our primary goal is to demonstrate the
    feasibility of obtaining the accuracy required for planetary-transit
    detection using image subtraction photometry on data collected with a
    1 m class telescope. We present a catalog of 62 variable stars, 47 of
    them newly discovered, most with low-amplitude variability. Among
    those there are several BY Draconis type variables. We have also
    observed outbursts in the cataclysmic variables B7 and B8.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        63       30   Eclipsing binaries in NGC 6791
table2.dat        61       21   Other periodic variables in NGC 6791
table3.dat        61       11   Other periodic variables in NGC 6791
lcurve/*          26      121   Light curves
                              (lcR.VNN, lcV.VNN, lcr.VNN, lcR.BNN, lcV.BNN)


See also:
     J/A+AS/114/1 : CCD UBVI photometry of NGC 6791 (Kaluzny+, 1995)
 ftp://cfa-ftp.harvard.edu/pub/bmochejs/PISCES : PISCES papers and data related


Byte-by-byte Description of file: table1.dat table2.dat table3.dat

   Bytes Format Units   Label     Explanations

   1-  3  A3    ---     ID        Identification name (VNN or BN)
                                  (VNN = Cl* NGC 6791 KR NN in Simbad)
                                   BNN = Cl* NGC 6791 KU BNN in Simbad)
   5- 13  F9.6  h       RAhour    Decimal right ascension (J2000)
  15- 23  F9.6  deg     DEdeg     Decimal declination (J2000)
  25- 31  F7.4  d       Per       ? Period
  34- 39  F6.3  mag     Rmax      ? R magnitude at maximum
      40  A1    ---     n_Rmax    [a] a: Instrumental magnitude
  42- 47  F6.3  mag     Vmax      ? V magnitude at maximum
  50- 54  F5.3  mag     AR        ? Amplitude in R band
  57- 61  F5.3  mag     AV        ? Amplitude in V band


Byte-by-byte Description of file: lcurve/*

   Bytes Format Units   Label     Explanations

   1- 11  F11.6 d    HJD-2450000  Heliocentric Julian date (HJD - 2450000)
  14- 19  F6.3  mag     mag       Magnitude (R, r or V)
  22- 26  F5.3  mag     e_mag     rms uncertainty on mag


History:
    From electronic version of the journal and
     ftp://cfa-ftp.harvard.edu/pub/bmochejs/PISCES/
(End)                         James Marcout, Patricia Bauer [CDS]    06-Sep-2002