The Age, Metallicity and Alpha-Element Abundance of GGCs from SSP models

[0705.4511 astro-ph] The Age, Metallicity and Alpha-Element Abundance …

The Age, Metallicity and Alpha-Element Abundance of Galactic Globular Clusters
from Single Stellar Population Models

Authors: Jon T. Mendel (Swinburne University), Robert N. Proctor (Swinburne), Duncan A. Forbes (Swinburne) (Submitted on 31 May 2007 (v1), last revised 31 May 2007 (this version, v2))

(…) Here we present age, metallicity and alpha-element abundance measurements for 48 Galactic globular clusters (GCs) as determined from integrated spectra using Lick indices and SSP models from Thomas, Maraston & Korn, Lee & Worthey and Vazdekis et al. By comparing our new measurements to independent determinations we are able to assess the ability of these SSPs to derive consistent results — a key requirement before application to heterogeneous stellar populations like galaxies(…).

22 pages, 19 figures, accepted for publication in MNRAS

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