Skip to main content

Research Repository

Advanced Search

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.

Precise mass and radius measurements for the components of the bright solar-type eclipsing binary star V1094 Tau Thumbnail


Authors

R.J. Hutcheon

G. Torres

C.H.S. Lacy

K. Pavlovski

L.A. Marschall

J.V. Clausen



Abstract

V1094 Tau is 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 M$_A$ = 1.0965 $\pm$ 0.0040 M$_{\odot}$, R$_A$ = 1.4109 $\pm$ 0.0058 R$_{\odot}$, T$_{\rm eff,A}$ = 5850 $\pm$ 100 K, and M$_B$ = 1.0120 $\pm$ 0.0028 M$_{\odot}$, R$_B$ = 1.1063 $\pm$ 0.0066 R$_{\odot}$, T$_{\rm eff,B}$ = 5700 $\pm$ 100 K. An analysis of the times of mid-eclipse and the radial velocity data reveals apsidal motion with a period of 14500 $\pm$ 3700 years. The observed masses, radii and effective temperatures are consistent with stellar models for an age $\approx$ 6 Gyr 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] $= -0.09 \pm 0.11$). 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-synchronously with the orbital motion.

Journal Article Type Article
Acceptance Date Mar 15, 2015
Online Publication Date May 27, 2015
Publication Date 2015-06
Publicly Available Date Mar 29, 2024
Journal Astronomy & Astrophysics
Print ISSN 0004-6361
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 578
Article Number A25
DOI https://doi.org/10.1051/0004-6361/201525873
Keywords stars, binaries, V1094 Tau, fundamental parameters, astrophysics
Publisher URL http://dx.doi.org/10.1051/0004-6361/201525873

Files




You might also like



Downloadable Citations