J/A+A/409/169 UBVRI light curves of AA Tau in 1999 (Bouvier+, 2003)
Eclipses by circumstellar material in the T Tauri star AA Tau.
II. Evidence for non-stationary magnetospheric accretion.
Bouvier J., Grankin K.N., Alencar S.H.P., Dougados C., Fernandez M.,
Basri G., Batalha C., Guenther E., Ibrahimov M.A., Magakian T.Y.,
Melnikov S.Y., Petrov P.P., Rud M.V., Zapatero Osorio M.R.
<Astron. Astrophys., 409, 169-192 (2003)>
=2003A&A...409..169B 2003A&A...409..169B
ADC_Keywords: Stars, pre-main sequence ; Photometry, UBVRI
Keywords: accretion, accretion disks - stars: pre-main sequence -
stars: magnetic fields - stars: individual: AA Tau
Abstract:
We report the results of a synoptic study of the photometric and
spectroscopic variability of the classical T Tauri star AA Tau on
timescales ranging from a few hours to several weeks. The AA Tau light
curve had been previously shown to vary with a 8.2d period,
exhibiting a roughly constant brightness level, interrupted by
quasi-cyclic fading episodes, which we interpreted as recurrent
eclipses of the central star by the warped inner edge of its accretion
disk (Bouvier et al. 1999, Cat. J/A+A/349/619). Our observations
show the system is dynamic and presents non-stationary variability
both in the photometry and spectroscopy.
Description:
he photometric observations were carried out over a period extending
from Aug. 9, 1999, to Jan. 4, 2000. AA Tau's light curve is best
sampled in the BVRI filters over the period from Nov. 25 to Dec. 15,
1999, when several sites observed simultaneously (see Table 1).
Objects:
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RA (2000) DE Designation(s) Bmag Vmag SpType
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04 34 55.5 +24 28 54 AA Tau 13.96 12.82 M0V:e
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ubvri.dat 33 976 UBVRI light curves of AA Tau
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See also:
J/A+A/349/619 : UBVRI light curves of AA Tau in 1995 (Bouvier+, 1999)
Table 1: Journal of observations.
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Dates (1999) Site Telescope Filters
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09/08-16/12 Mt Maidanak 0.5 m UBVR
29/11-15/12 OHP 1.20 m UBVRI
25/11-02/12 Calar Alto 1.50 m BVRI
26/11-04/01 Teide 0.80 m BVRI
30/11-08/12 Byurakan 2.6 m VRI
08/09-30/09 Almaty 1 m BVR
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Byte-by-byte Description of file: ubvri.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d JD Julian date
17- 22 F6.3 mag Mag Magnitude
27- 31 F5.3 mag e_Mag Error on magnitude
33 A1 --- Filter [UBVRI] Filter
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Acknowledgements: Jerome bouvier
References:
Bouvier et al., Paper I 1999A&A...349..619B 1999A&A...349..619B, J/A+A/349/619
(End) Patricia Bauer [CDS] 15-Jan-2004