The radius and other fundamental parameters of the F9 V star β Virginis |
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| Authors: | J R North J Davis J G Robertson T R Bedding H Bruntt M J Ireland A P Jacob S Lacour J W O'Byrne S M Owens D Stello W J Tango P G Tuthill |
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| Institution: | Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia |
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| Abstract: | We have used the Sydney University Stellar Interferometer (SUSI) to measure the angular diameter of the F9 V star β Virginis (β Vir). After correcting for limb darkening and combining with the revised Hipparcos parallax, we derive a radius of 1.703 ± 0.022 R⊙ (1.3 per cent). 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 per cent). We also derived the luminosity of β Vir to be L = 3.51 ± 0.08 L⊙ (2.1 per cent). Solar-like oscillations were measured in this star by Carrier et al. and using their value for the large frequency separation yields the mean stellar density with an uncertainty of about 2 per cent. Our constraints on the fundamental parameters of β Vir will be important to test the theoretical models of this star and its oscillations. |
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| Keywords: | techniques: interferometric stars: fundamental parameters stars: individual: β Vir |
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