2007/07/03 by Julian North, J. R. North, J. Davis +12 · 39 citations
Chemistry · Physics and Astronomy · #Asteroseismology #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Chemistry #Gamma-ray bursts and supernovae #Globular cluster #Interferometry #Oscillation (cell signaling) #Physics #RADIUS #Stars #Stellar, planetary, and galactic studies #Subgiant #astro-ph
paper · pdf · doi:10.1111/j.1745-3933.2007.00355.x
published in Monthly Notices of the Royal Astronomical Society Letters 380(1), L80-L83 (Oxford University Press) · 3 figures, 3 tables, to appear in MNRAS Letters
arxiv created 2007/07/03 · openalex publication_date 2007/07/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract We have used the Sydney University Stellar Interferometer to measure the angular diameter of β Hydri. This star is a nearby G2 subgiant the mean density of which 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⊙ (0.9 per cent) and 5872 ± 44 K (0.7 per cent) respectively. By combining the radius 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⊙ (2.8 per cent), which agrees with published estimates based on fitting in the Hertzsprung–Russell diagram, but has much higher precision. These results place valuable constraints on theoretical models of β Hyi and its oscillation frequencies.