New Age Indicators for Old Stellar Populations

Details New Age Indicators for Old Stellar Populations New Age Indicators for Old Stellar Populations

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446l..31j&link_type=abstract

Astrophysical Journal Letters v.446, p.L31

Astronomy and Astrophysics

Astronomy

81

Galaxies: Abundances, Galaxies: Elliptical And Lenticular, Cd, Galaxies: Evolution, Galaxies: Formation, Galaxies: Stellar Content

Scientific paper

We report on new age indicators in the integrated light of old stellar populations. Spectral indices defined by Rose in the 3800-4500 A region and two broader indices, HδA and HγA, have been measured in a spectral library of about 500 stars. The behavior of these indices with temperature, gravity, and [Fe/H] was modeled with polynomials, and they were included in the population models of Worthey (1994). All definitions of Hδ and Hγ are sensitive to population age. One index in particular, HγHR, shows a striking ability to separate the effects of age and metal abundance in integrated light.

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