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J/A+AS/115/41       UBV(RI) photometry of cool stars (Cutispoto+, 1996)
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Photometric and spectroscopic studies of cool stars discovered in EXOSAT
X-ray images. III. Photometric properties
       Cutispoto G., Tagliaferri G., Pallavicini R., Pasquini L., Rodono M.
      <Astron. Astrophys. Suppl. Ser. 115, 41 (1996)>
      =1996A&AS..115...41C      (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry, UBVRI ; Stars, late-type ; X-ray sources
Keywords: stars: activity - stars: late-type - stars: variables - X-ray: stars

Description:
    We present high-precision UBV(RI)_c_ photometry for a sample of active
    stars detected serendipitously by the EXOSAT satellite. Fourteen
    objects, out of 47 likely optical counterparts, turned out to be
    clearly variable, with periods in the range 1-8 days, including a
    newly discovered eclipsing binary. For most of them the optical
    variability is consistent with the presence of photospheric cool
    spots. We have used our multicolour photometry to estimate spectral
    classifications and distances. The derived distances indicate that
    some of the observed stars are previously unidentified nearby
    (d<=25pc) M dwarfs. When combined with the results of high resolution
    spectroscopy, our photometric observations allow us to investigate the
    stellar content of the selected X-ray sample. Young stars and RS
    CVn-type binaries appear to constitute a large fraction of the
    selected sample. For a description of the UBV and (RI)c photometric
    systems, see e.g.
    <http://obswww.unige.ch/gcpd/ph01.html> and
    <http://obswww.unige.ch/gcpd/ph54.html>.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table2             58      101   Photometric data for the observed stars
table3             67       54   Photometric data
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Byte-by-byte Description of file: table2
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   Bytes Format Units   Label     Explanations
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   2-  3  I2    ---     Id        Identification number
   5- 21  A17   ---     Name      EXOSAT name (Catalogue <VI/43>)
  23- 25  A3    ---    ObsSeason  Code for the observing season (1)
      26  A1    ---  n_ObsSeason  When "o": data from Paper I:
                                  Cutispoto G. et al 1991
  28- 32  F5.2  mag     Vmax      V magnitude at maximum luminosity
  34- 37  F4.2  mag     U-B       ? U-B color index
  39- 42  F4.2  mag     B-V       B-V color index
  44- 47  F4.2  mag     V-Rc      V-R_c_ color index (Cousins)
  49- 52  F4.2  mag     V-Ic      V-I_c_ color index (Cousins)
      54  A1    ---     Qual      Quality of the data
      57  A1    ---     Var       Variability flag
      58  A1    ---   n_Var       [?] Uncertainty on variability flag
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Note (1): The code is composed by the initial of the month followed
           by the two last numbers of the year.
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Byte-by-byte Description of file: table3
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   Bytes Format   Units   Label    Explanations
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   2-  6 A5        ---    Id       Identification number
   8- 24 A17       ---    EXOSAT   EXOSAT name
  25- 34 A10       ---    Other    Other catalogue number
  36- 46 A11       ---    Sp       Spectral type
  48- 51 I4        pc     Dist     ? Distance
      52 A1        ---  n_Dist     [?] Uncertainty on distance
      54 A1        ---    Var      Variability flag
  56- 60 F5.3      d      Period   ? Period of variability
      61 A1        ---  n_Period   [?] Uncertainty on period of variability
      63 A1        ---  l_DeltaV   [>] Limit flag on amplitude in V-band
  64- 67 F4.2      mag    DeltaV   ? Amplitude in the V-band
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References:
   Cutispoto G. et al 1991 A&AS 87, 233             =1991A&AS...87..233C
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(End)                                             Simona Mei [CDS]   25-Sep-1995