Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-12
Astronomy and Astrophysics
Astrophysics
accepted for publication in MNRAS. Updated references
Scientific paper
10.1111/j.1365-2966.2008.14216.x
We have used the Sydney University Stellar Interferometer (SUSI) to measure the angular diameter of the F9 V star beta Virginis. After correcting for limb darkening and combining with the revised Hipparcos parallax, we derive a radius of 1.703 +/- 0.022 R_sun (1.3%). We have also calculated the bolometric flux from published measurements which, combined with the angular diameter, implies an effective temperature of 6059 +/- 49 K (0.8%). We also derived the luminosity of beta Vir to be L = 3.51 +/- 0.08 L_sun (2.1%). Solar-like oscillations were measured in this star by Carrier et al. (2005) and using their value for the large frequency separation yields the mean stellar density with an uncertainty of about 2%. Our constraints on the fundamental parameters of beta Vir will be important to test theoretical models of this star and its oscillations.
Bedding Tim R.
Bruntt Hans
Davis Jared
Ireland Michael J.
Jacob Andrew P.
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