J/A+A/521/A36 BV differential photometry of V711 Tau (Muneer+, 2010)
Orbital period modulation and spot activity in the RS CVn binary V711 Tauri.
Muneer S., Jayakumar K., Rosario M.J., Raveendran A.V., Mekkaden M.V.
<Astron. Astrophys. 521, A36 (2010)>
=2010A&A...521A..36M 2010A&A...521A..36M
ADC_Keywords: Stars, variable ; Photometry, UBV
Keywords: stars: activity - binaries: spectroscopic -
stars: individual: V711 Tau - stars: late-type - starspots
Abstract:
We attempt to establish the real nature of the orbital period
variation and its relation to the spot activity of V711 Tau, and
determine why the (B-V) colour of the star appears to be nearly
independent of its V magnitude. We wish to verify whether existing
predictions in the literature for the long-term spot activity of the
star are true or not by making extended photometric observations, and
whether the broad component of Hα emission originates in more
localised active regions, as suggested by some chromospheric models,
by searching for any correlation between the base-line width of the
emission and the light modulation.
Description:
We obtained new radial velocities of the G-type component of V711 Tau
on 42 nights during 2004-09, and BV photometry of V711 Tau on 202
nights during the years 1993-2009. We measured the equivalent widths
of two well resolved lines of the G-type component from 13 of the
spectra obtained by us. We also measured the equivalent widths and
base-line widths of Hα emission from 21 spectra obtained during
2008-09. We analyse these along with relevant information available
in the literature.
Table 2 contains Julian days and the corresponding differential V and
(B-V) values of V711 Tau with respect to 10 Tau.
Objects:
---------------------------------------------
RA (2000) DE Designation(s)
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03 36 47.3 +00 35 16 V711 Tau = HD 22468
03 36 52.4 +00 24 06 10 Tau = HD 22484
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 25 221 Differential BV photometry of V711 Tau
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Julian day of observation
14- 18 F5.3 mag dVmag Differential V magnitude
21- 25 F5.3 mag dB-V ?=- Differential (B-V) colour index
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Acknowledgements:
S. Muneer, muneers(at)iiap.res.in
(End) Patricia Vannier [CDS] 08-Jul-2010