Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342302w&link_type=abstract
American Astronomical Society, AAS Meeting #213, #423.02; Bulletin of the American Astronomical Society, Vol. 41, p.243
Astronomy and Astrophysics
Astronomy
Scientific paper
Simple formulae are developed for relating uncertainties in stellar population parameters for local star clusters (distance, abundance, and reddening) filtered through stellar population models and applied to the uncertainties in the ages of distant galaxies. Uncertainties due to stellar structure, effects such as helium diffusion and rotation, bolometric corrections, and photometry are considered in order to gauge the effects of as many items as possible on the absolute and relative ages of star clusters. It is shown that space missions GAIA and SIM, if successful, will make a quantum leap of precision in assigning the ages of past star formation episodes in high redshift galaxies through their radical increase in the precision of direct stellar parallaxes. GAIA will assign distances to key nearby star clusters, and SIM will reach those plus distant clusters, including the Milky Way globular cluster system. Final age estimates after SIM should be good to 5 percent ought to be routine given good quality spectra of high redshift galaxies.
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