Access to Astronomical Catalogues

J/MNRAS/358/795     Variable stars in NGC 6819 field         (Street+, 2005)
Variable stars in the field of open cluster NGC 6819 - II.
    Street R.A., Horne K., Lister T.A., Penny A., Tsapras Y., Quirrenbach A.,
    Safizadeh N., Cooke J., Mitchell D., Cameron A.C.
   <Mon. Not. R. Astron. Soc., 358, 795-812 (2005)>
   =2005MNRAS.358..795S
ADC_Keywords: Clusters, open ; Stars, variable ; Photometry, CCD

Keywords: binaries: eclipsing - stars: variables: other -
          open clusters and associations: individual: NGC 6819

Abstract:
    We report on the discovery of 141 further variable stars found in the
    field of the open cluster NGC 6819. The stars were identified from
    time-series photometric data obtained on the Isaac Newton Telescope,
    La Palma, during two observing runs covering the 19 nights between
    1999 June 22-30 and 1999 July 22-31. The variables found include 53
    eclipsing binaries, of which eight stars appear to be RS CVns, in
    addition to 70 stars showing spot activity, 13 showing long-period
    variability and five variables of other types.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
tab3-10.dat      124      155   Details of the eclipsing binary and BY Dra systems
tab11-13.dat     124       33   Details of variables stars


Byte-by-byte Description of file: tab3-10.dat tab11-13.dat

   Bytes Format Units   Label     Explanations

   1-  5  A5    ---     ObsID     Observation ID (CCD 1 to CCD 4)
   7- 11  I5    ---     SHLP      Star number, Cl* NGC 6819 SHLP NNNNN in Simbad
      12  A1    ---     n_SHLP    [*] Individual note (1)
      13  A1    ---     ---       [(]
  14- 17  I4    ---     OldSeq    ? star's original identification number
                                    (in Street et al., 2003MNRAS.340.1287S)
      18  A1    ---     ---       [)]
  20- 22  A3    ---     f_SHLP    Flag on star (2)
  24- 25  I2    h       RAh       Right ascension (J2000.0)
  27- 28  I2    min     RAm       Right ascension (J2000.0)
  30- 34  F5.2  s       RAs       Right ascension (J2000.0)
      36  A1    ---     DE-       Declination sign (J2000.0)
  37- 38  I2    deg     DEd       Declination (J2000.0)
  40- 41  I2    arcmin  DEm       Declination (J2000.0)
  43- 46  F4.1  arcsec  DEs       Declination (J2000.0)
  48- 59  F12.4 d       T0        ? Epoch of minimum light in HJD
  61- 66  F6.4  d       e_T0      ? rms uncertainty on T0
      67  A1    ---     n_T0      [m] m: multi-periodic ?
  68- 75  F8.5  d       Per       ? Period
  77- 84  F8.5  d       e_Per     ? rms uncertainty on Per
  86- 91  F6.3  mag     Vmag      ? V magnitude
  93- 96  F4.3  mag     e_Vmag    ? rms uncertainty on Vmag
  98-101  F4.2  mag     V-R       ? V-R colour index
 103-105  F3.2  mag     e_V-R     ? rms uncertainty on V-R
 107-112  A6    ---     Type      Binary or variable type (3)
     114  A1    ---     l_Amp     Limit flag on Amp
 115-119  F5.3  mag     Amp       ? Amplitude
 120-124  A5    ---     n_Amp     Notes on multiperiodicity (4)

Note (1): Following reanalysis, star 30608 is now below the
     threshold for variability
Note (2): Flags as follows:
      C = close bright companions
      B = blended
      E = close to edge of frame
      H = in halo of very bright star
      F = close to flaw in image, e.g. dead column,
          light leak or diffraction spike.
      S = suspected variable
Note (3): Binary and variable types as follows:
         EW = W UMa type (binary)
         EA = Algol type (binary)
         EB = β Lyrae type (binary)
     RS CVn = RS CVn type (binary)
     BY Dra = BY Dra type (binary)
         LP = long period variable (variable)
        Cep = Cepheid (variable)
     RR Lyr = RR Lyr variable (variable)
      d Scu = δ Scuti variable (variable)
       Uncl = Unclassified (variable)
         SV = suspected variable (variable)
Note (4): 2 entries exist in the tables for stars showing signs of
    stellar activity as well as eclipses; the note specifies (act)
    or (ecl) in these cases.


History:
    From electronic version of the journal

References:
     Street et al., Paper I       2003MNRAS.340.1287S
(End)                                      Patricia Vannier [CDS]    23-Feb-2006