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J/A+A/299/557       Light variations on Beta Pic  (Lecavelier des Etangs+, 1995)
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Beta Pictoris: Evidence of light variations
     Lecavelier des Etangs A., Deleuile M., Vidal-Madjar A., Ferlet R.
     Nitschelm C., Nicolet B., Lagrange-Henri A.M.
    <Astron. Astrophys. 299, 557 (1995)>
    =1995A&A...299..557L        (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, nearby; Photometry, Geneva
Keywords: stars: Beta Pic - circumstellar matter - planetary systems

Description:
   We have analyzed {beta} Pictoris photometric measurements obtained from La
   Silla by the Geneva Observatory from 1975 to 1992. These data show evidence
   of variations in the brightness of the star, with no color dependency. Here,
   we demonstrate that the light variations are present on long as well as on
   short time scales. On a long time scale, we show that the apparent magnitude
   of {beta} Pictoris decreased by 0.011+/-0.004mag from 1979 to 1982. Moreover,
   when we consider all the measurements, the chance that there is no variation
   at all can be estimated to be less than 10^-4^. On short time scales there
   is a peculiar feature observed during about 30 days; the variations may be
   as high as 0.04mag magnitude. A maximum entropy reconstruction of the
   photometric data is tentatively proposed and some physical interpretations
   are presented.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table              71      238   Geneva photometry
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Byte-by-byte Description of file: table
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   Bytes Format  Units   Label    Explanations
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   2- 12  F11.3  d       JD       Julian date
      17  I1     ---   q_Vmag     Quality factor of the V magnitude
  20- 24  F5.3   mag     Vmag     V magnitude
      29  I1     ---   q_colours  Quality factor of the colour indexes
  32- 36  F5.3   mag     U-B      U-B colour index
  39- 43  F5.3   mag     V-B      V-B colour index
  46- 50  F5.3   mag     B1-B     B1-B colour index
  53- 57  F5.3   mag     B2-B     B2-B colour index
  60- 64  F5.3   mag     V1-B     V1-B colour index
  67- 71  F5.3   mag     G-B      G-B colour index
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(End)                             Simona Mei, Patricia Bauer [CDS]   21-Feb-1995