Mid-ultraviolet spectral templates for single-age single-metallicity systems

Details Mid-ultraviolet spectral templates for single-age single-metallicity systems Mid-ultraviolet spectral templates for single-age single-metallicity systems

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..61p&link_type=abstract

Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.

Astronomy and Astrophysics

Astrophysics

Scientific paper

This is a progress report for our Hubble Treasury program GO-10094. Our goal is to provide both theoretical and observational spectral templates for the mid-ultraviolet, from 2200Å to 3150Å and beyond, for a quantitative interpretation of the spectrum of a stellar system such as a globular cluster or elliptical galaxy. This is aimed at determining the age and metallicity of systems as young as 1 Gyr. We are now calculating grids of theoretical spectral templates for stars all across the color-magnitude diagram, from red giants to turn-off stars to blue stragglers to extreme blue horizontal branch stars. The grids span a wide range of metallicities, and incorporate both the solar mix of elemental abundances and mixes with enhanced abundances of light elements such as magnesium. At the same time we are calculating stellar tracks and isochrones for these metallicities and mixtures. We will then generate theoretical spectral templates for single-age, single-metallicity systems by coadding the stellar spectra with weights derived from the isochrones. We will make public the stellar and composite grids, as well as broad-band indices and colors derived from them. We present examples of the excellent matches between observed and theoretical spectra achieved to date, in both the ultraviolet and the optical spectral regions. We also illustrate the application of these theoretical spectra to several problems, from the determination of very heavy elements produced by the s- and r-process in individual stars, to the age and metallicity of extragalactic globular clusters and remote galaxies.

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