Beta Hydri (G2 IV): a revised age for the closest subgiant

Details Beta Hydri (G2 IV): a revised age for the closest subgiant Beta Hydri (G2 IV): a revised age for the closest subgiant

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...330.1077d&link_type=abstract

Astronomy and Astrophysics, v.330, p.1077-1079 (1998)

Astronomy and Astrophysics

Astrophysics

15

Space Astrometry, Stars: Evolution, Stars: Individual: Beta Hyi, Stars: Late-Type

Scientific paper

The secular evolution of solar-type atmospheres may be studied through comparisons of the current Sun with old solar-type stars of known age. Among the few such stars in the solar Galactic neighborhood, beta Hydri (G2 IV) stands out as a normal single star with an advanced age. Previous age determinations ( =~ 9.5 Gy) were based on the old ground-based parallax of 153 mas. The new Hipparcos value of 133.78+/- 0.51 mas implies an absolute magnitude M_V=3.43 +/- 0.01, 0.3 mag brighter than previously believed. New evolutionary calculations produce best-fit models with ages around 6.7 Gy. Although the Hipparcos data thus lead to a significant reduction of its estimated age, beta Hyi remains an old star. Based on observations made with the ESA Hipparcos astrometry satellite

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