The radius and mass of the subgiant star bet Hyi from interferometry and asteroseismology

Details The radius and mass of the subgiant star bet Hyi from interferometry and asteroseismology The radius and mass of the subgiant star bet Hyi from interferometry and asteroseismology

2007-07-03

arxiv.org/abs/0707.0333v1

Astronomy and Astrophysics

Astrophysics

3 figures, 3 tables, to appear in MNRAS Letters

Scientific paper

10.1111/j.1745-3933.2007.00355.x

We have used the Sydney University Stellar Interferometer (SUSI) to measure the angular diameter of beta Hydri. This star is a nearby G2 subgiant whose mean density was recently measured with high precision using asteroseismology. We determine the radius and effective temperature of the star to be 1.814+/-0.017 R_sun (0.9%) and 5872+/-44 K (0.7%) respectively. By combining this value with the mean density, as estimated from asteroseismology, we make a direct estimate of the stellar mass. We find a value of 1.07+/-0.03 M_sun (2.8%), which agrees with published estimates based on fitting in the H-R diagram, but has much higher precision. These results place valuable constraints on theoretical models of beta Hyi and its oscillation frequencies.

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