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J/AJ/128/1761          HATNET variability survey                (Hartman+, 2004)
HATNET variability survey in the high stellar density "Kepler field" with
millimagnitude image subtraction photometry.
    Hartman J.D., Bakos G., Stanek K.Z., Noyes R.W.
   <Astron. J., 128, 1761-1783 (2004)>
   =2004AJ....128.1761H
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Photometry, Cousins ;
              Photometry, infrared
Keywords: binaries: eclipsing - catalogs - Cepheids - δ Scuti -
          stars: variables: other - techniques: photometric

Abstract:
    The Hungarian-made Automated Telescope Network (HATnet) is an ongoing
    project to detect transiting extrasolar planets using small-aperture
    (11cm diameter) robotic telescopes. In this paper, we present the
    results from using image subtraction photometry to reduce a crowded
    stellar field observed with one of the HATnet telescopes (HAT-5). This
    field was chosen to overlap with the planned Kepler mission. We
    obtained I-band light curves for 98,000 objects in a 67 square degree
    field of view centered at J2000 (α,δ)=(19h44m00.0s,
    +37°32'00.0"), near the Galactic plane in the constellations
    Cygnus and Lyra. These observations include 788 exposures of 5' length
    over 30-days. For the brightest stars (I∼8.0) we achieved a precision
    of 3.5mmag, falling to 0.1mag at the faint end (I∼14). From these
    light curves we identify 1617 variable stars, of which 1439 are newly
    discovered.

Description:
    The data were obtained in 2003 June and July using the HAT-5 telescope
    located at the Fred Lawrence Whipple Observatory (FLWO).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       126     1617   HAT Catalog of "Kepler Field" Variables
lc/*              39     1617  *Light Curves

Note on lc/*: from http://cfa-www.harvard.edu/~gbakos/HAT/LC/199/



See also:
  http://cfa-www.harvard.edu/~gbakos/HAT/LC/199/ : Catalog and Light Curves
  II/250 : Combined General Catalogue of Variable Stars (Samus+ 2004)
  II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)


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

   Bytes Format Units  Label    Explanations

   1-  6  A6    ---    ---      [HAT199]
   7- 11  I05   ---    HAT199   The HAT identification
  13- 14  I2    h      RAh      Hour of right ascension (J2000)
  16- 17  I2    min    RAm      Minute of right ascension (J2000)
  19- 23  F5.2  s      RAs      Second of right ascension (J2000)
      24  A1    ---    DE-      Sign of the Declination (J2000)
  25- 26  I2    deg    DEd      Degree of declination (J2000)
  28- 29  I2    arcmin DEm      Arcminute of declination (J2000)
  31- 34  F4.1  arcsec DEs      Arcsecond of declination (J2000)
  36- 41  F6.3  mag    Icmag    Reference Cousins I-band magnitude
  43- 48  F6.3  mag    Jmag     ? 2MASS (Cat. II/246) J-band magnitude
  50- 55  F6.3  mag    Hmag     ? 2MASS (Cat. II/246) H-band magnitude
  57- 62  F6.3  mag    Kmag     ? 2MASS (Cat. II/246) K-band magnitude
  64- 74  F11.6 ---    USNO     ? The USNO-B1 identification (Cat. I/284)
  76- 78  A3    ---    Class    Variable classification (1)
  80- 85  F6.3  mag    Icmin    Minimum I-band magnitude measurement
  87- 92  F6.3  mag    Icmax    Maximum I-band magnitude measurement
  94-100  F7.4  d      Per      ? Period
 102-110  A9    ---    GCVS     The GCVS identification (2)
 112-118  A7    ---    Vclass   The GCVS classification (2)

Note (1): The variable classification is defined as follows:
    LPV = Long-period variable
    ECL = Eclipsing variable
    PUL = Pulsating variable
    MIS = Miscelleneous variable
Note (2): GCVS = Combined General Catalogue of Variable Stars (Kholopov
    et al.  1998, see Cat. II/250).


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

   Bytes Format Units   Label     Explanations

   3- 13  F11.6 d     JD-2450000  Date/time of observation
  17- 24  F8.5  mag     Imag      Cousins magnitude
  29- 35  F7.5  mag     e_Imag    Mean error on Imag
  37- 39  I3    ---     Nf        Number of frames


History:
    From electronic version of the journal
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    20-Apr-2005