The Mg/Fe characterization of the MILES library for stellar populations studies

Details The Mg/Fe characterization of the MILES library for stellar populations studies The Mg/Fe characterization of the MILES library for stellar populations studies

2009-09-17

arxiv.org/abs/0909.3291v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

2 pages, 1 colourful figure, submitted (with a simpler black and white figure) to the Proceedings IAU Symposium No. 262 'Stell

Scientific paper

We have obtained [Mg/Fe] for around 77% of the stars of the MILES library of stellar spectra in order to include this important information into simple stellar population (SSP) models. The abundance ratios, which were carefully calibrated to a single uniform scale, were obtained through a compilation from high spectral resolution works plus robust spectroscopic analysis at medium resolution. The high resolution data provided an extensive control sample. Average uncertainties (0.06 and 0.12 dex for the high and medium resolution samples respectively) and the good coverage of the stars with [Mg/Fe] over the MILES's parameter space will permit us to semi-empirically build up new SSP models with accurate alpha-enhancements for ages older than 1 Gyr. This will open new prospects for evolutionary stellar population synthesis.

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