Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-06-04
Astrophys.Space Sci. 276 (2001) 893-900
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, to appear in "The Evolution of galaxies on Cosmological timescales", A&SS, in press
Scientific paper
10.1023/A:1017577207926
The study of line strengths in the spectra of early-type galaxies has proven to be a powerful tool for investigating the age and the metallicity of these systems. When computing models for spectrophotometric narrow-band indices, index calibrations as functions of the relevant stellar parameters (e.g. temperature, gravity and metal content) are used. Thus synthetic indices depend upon these calibrations (called fitting functions), as well as on the stellar evolution ingredients adopted. All these inputs suffer from uncertainties, which impact on the derived value for the indices. In this paper we address this problem quantitatively. We compute synthetic Mg2, Fe5270, Fe5335 and Hbeta indices for Simple Stellar Populations (SSP) of various ages and metallicities, under different prescriptions for the fitting functions. This allows us to estimate the impact of the uncertainties in the fitting functions. By comparing our models to those of other authors computed with the same fitting functions, we estimate the uncertainty associated to the use of different stellar evolution prescriptions. It is found that the modelling of the Horizontal Branch impacts particularly on
Greggio Laura
Maraston Claudia
Thomas Daniel
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