J/A+A/578/A25 Light curves for the eclipsing binary V1094 Tau (Maxted+, 2015)
Precise mass and radius measurements for the components of the bright
solar-type eclipsing binary star V1094 Tau.
Maxted P.F.L., Hutcheon R.J., Torres G., Lacy C.H.S., Southworth J.,
Smalley B., Pavlovski K., Marschall L.A., Clausen J.V.
<Astron. Astrophys. 578, A25 (2015)>
=2015A&A...578A..25M 2015A&A...578A..25M
ADC_Keywords: Binaries, eclipsing ; Photometry, uvby ; Spectroscopy
Keywords: binaries: eclipsing - stars: solar-type -
stars: fundamental parameters - stars: individual: V1094 Tau
Abstract:
V1094 Tau is a bright eclipsing binary star with an orbital period
close to 9 days containing two stars similar to the Sun. Our aim is to
test models of Sun-like stars using precise and accurate mass and
radius measurements for both stars in V1094 Tau. We present new
spectroscopy of V1094 Tau which we use to estimate the effective
temperatures of both stars and to refine their spectroscopic orbits.
We also present new, high-quality photometry covering both eclipses of
V1094 Tau in the Stroemgren uvby system and in the Johnson V-band. The
masses, radii and effective temperatures of the stars in V1094 Tau are
found to be MA=1.0965±0.0040M☉,
RA=1.4109±0.0058R☉, Teff,A=5850±100K, and
MB=1.0120±0.0028M☉, RB=1.1063±0.0066R☉,
Teff,B=5700±100K. An analysis of the times of mid-eclipse and the
radial velocity data reveals apsidal motion with a period of
14500±3700-years. The observed masses, radii and effective
temperatures are consistent with stellar models for an age ∼6Gyr if
the stars are assumed to have a metallicity similar to the Sun. This
estimate is in reasonable agreement with our estimate of the
metallicity derived using Stroemgren photometry and treating the
binary as a single star ([Fe/H]=-0.09±0.11). The rotation velocities
of the stars suggest that V1094 Tau is close to the limit at which
tidal interactions between the stars force them to rotate
pseudo-syncronously with the orbital motion.
Description:
Photometric light curves of the detached eclipsing binary V1094 Tau in
the Stroemgren u-,v-,b- and y-bands, and in the Johnson V-band. The
curves in the Stroemgren bands were obtained with the Stroemgren
Automatic Telescope (SAT) at ESO, La Silla. The curves in the V-band
were obtained with the NFO telescope in New Mexico and with the URSA
telescope at the University of Arkansas.
Objects:
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RA (2000) DE Designation(s)
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04 12 03.59 +21 56 50.6 V1094 Tau = HD 284195
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
u.dat 20 670 u-band light curve from Stroemgren Automatic Tel.
v.dat 20 670 v-band light curve from Stroemgren Automatic Tel.
b.dat 20 670 b-band light curve from Stroemgren Automatic Tel.
y.dat 20 670 y-band light curve from Stroemgren Automatic Tel.
v_nfo.dat 20 5714 V-band light curve with NFO tel. (New Mexico)
v_ursa.dat 20 8085 V-band light curve with URSA tel. (Arkansas)
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Byte-by-byte Description of file: *.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Time of exposure (HJD-2400000)
15- 20 F6.3 mag Dmag Differential magnitude
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References:
Pierre Maxted, p.maxted(at)keele.ac.uk
(End) Patricia Vannier [CDS] 08-Apr-2015