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2004MNRAS.351..487P - Mon. Not. R. Astron. Soc., 351, 487-504 (2004/June-3)
Isochrone ages for field dwarfs: method and application to the age-metallicity relation.
PONT F. and EYER L.
Abstract (from CDS):
We apply our method to the classic sample of Edvardsson et al., who derived the age-metallicity relation (AMR) of 189 field dwarfs with precisely determined abundances. We show how much of the observed scatter in the AMR is caused by the interplay between the systematic biases affecting the traditional age determination, the colour mismatch with the evolution models and the presence of undetected binaries. Using new parallax, temperature and metallicity data, our age determination for the same sample indicates that the intrinsic dispersion in the AMR is at most 0.15 dex and probably lower. In particular, we show that old, metal-rich objects ([Fe/H]∼ 0.0 dex, age > 5 Gyr) and young, metal-poor objects ([Fe/H] < -0.5 dex, age < 6 Gyr) in many observed AMR plots are artefacts caused by too simple a treatment of the age determination. The incompatibility of those AMR plots with a well-mixed interstellar medium may therefore only be apparent. Incidentally, our results tend to restore confidence in the method of age determination from the chromospheric activity for field dwarfs.
Abstract Copyright: 2004 RAS
Journal keyword(s): methods: statistical - stars: evolution - stars: fundamental parameters - Hertzsprung-Russell (HR) diagram - Galaxy: evolution
Simbad objects: 29
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