Age determinations of main-sequence stars: combining different methods

Details Age determinations of main-sequence stars: combining different methods Age determinations of main-sequence stars: combining different methods

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...348..897l&link_type=abstract

Astronomy and Astrophysics, v.348, p.897-909 (1999)

Astronomy and Astrophysics

Astrophysics

118

Stars: Activity, Stars: Chromospheres, Stars: Evolution, Stars: Rotation

Scientific paper

We have determined the age of a sample of nearby main-sequence stars with spectral types B9-K9. We have derived the stellar ages from five different age estimators: the location in the HR diagram compared to theoretical isochrones, the rotational velocity, the strength of chromospheric calcium emission lines, the stellar metallicity, and their space velocity. New calibrations consistent with recent theoretical isochrones are provided for the last four indicators. For hot stars, isochrones are the best indicator, while stellar rotation is best for cool stars. However, many stars require in fact a combination of different methods to properly bracket their actual age. We also discuss the uncertainties involved, in particular those in using isochrones, and we find that these uncertainties are often underestimated in the literature.

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