J/A+A/299/557 Light variations on Beta Pic (Lecavelier des Etangs+, 1995)
Beta Pictoris: Evidence of light variations
LECAVELIER DES ETANGS A., DELEUILE M., VIDAL-MADJAR A., FERLET R.
NITSCHLEM C., NICOLET B., LAGRANGE-HENRI A.M.
<Astron. Astrophys. 299, 557 (1995)>
=1995A&A...299..557L 1995A&A...299..557L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby; Photometry, Geneva
Keywords: stars: Beta Pic - circumstellar matter - planetary systems
Description:
We have analyzed β 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 β 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