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J/A+A/291/110       ER Vulpeculae                                  (Olah+, 1994)
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The active close binary system ER Vulpeculae
       Olah K., Budding E., Kim H.-I., Etzel P.B.
      <Astron. Astrophys. 291, 110 (1994)>
      =1994A&A...291..110O      (SIMBAD/NED Reference)
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ADC_Keywords: Binaries, eclipsing; Photometry, UBVRI
Keywords: stars: ER Vul - stars: activity - binaries: eclipsing -
          fundamental parameters - imaging

Abstract:
    UBV (RI)c photometry of the short period RS CVn binary ER Vul, gathered 
    in the years 1990-1992, is analyzed. A set of binary system parameters is 
    finally derived with some confidence, after due tests and comparisons with
    literature values. The well-known irregularities of ER Vul are interpreted
    largely in terms of dark maculae, whose major characteristics (size, 
    surface position) are quantified. The occurrence of at least one bright 
    spot (facula) is also evidenced, however. The maculation representation is
    shown to be consistent with a 'quasi-poloidal' spot distribution - high 
    latitude spot concentrations tending to be roughly symmetric in both 
    hemispheres. This model requires further observational checking. 

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table           50        933    UBV(RI)c photometry of ER Vul
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Byte-by-byte Description of file: table
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   Bytes Format  Units   Label    Explanations
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   1- 13  F13.4  d       JDH      Heliocentric Julian day
  17- 22  F6.3   mag     U        []? U magnitude
  24- 29  F6.3   mag     B        []? B magnitude
  31- 36  F6.3   mag     V        []? V magnitude
  38- 43  F6.3   mag     Rc       []? Rc magnitude
  45- 50  F6.3   mag     Ic       []? Ic magnitude
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Note: Observations were made in 1990 August-September, 1991 August and 1992
  August-September at the Mountain Station of Konkoly Observatory of the
  Hungarian Academy of Sciences. We used the 1-m RCC telescope equipped
  with a thermoelectrically cooled photometer with filters matching the
  UBV(RI)c system. Average transformation and extinction coefficients were
  used to reduce our data to the standard system.
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(End)                                         Patricia Bauer [CDS]   30-Jun-1994