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

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..397d&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 397-400

Computer Science

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 age, beta Hyi remains an old star.

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