Metallicities and ages in the galactic disk

Details Metallicities and ages in the galactic disk Metallicities and ages in the galactic disk

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..588n&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Stellar Abundances

Scientific paper

Metallicities ages and full Galactic orbits have been derived for a complete kinematically unbiased sample of 14.000 F and G dwarfs in the Solar neighbourhood. The observational data are Strömgren uvbybeta photometry Hipparcos/TYCHO astrometry and extensive new radial-velocity observations from which duplicity information is available for all the stars as well. Special attention has been given to developing and testing a new algorithm for age determination of field stars from theoretical isochrones with particular emphasis on deriving realistic error estimates also for the oldest stars and on identifying the stars for which no meaningful ages can in fact be derived. The results challenge traditional views of the chemical enrichment history of the Galactic disk.

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