Stellar Population Models with Variable Element Abundance Ratios

Details Stellar Population Models with Variable Element Abundance Ratios Stellar Population Models with Variable Element Abundance Ratios

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..189t&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

We provide the whole set of Lick indices from CN1 to TiO2 of Simple Stellar Population models with for the first time variable element abundance ratios. Our models are free from the intrinsic alpha/Fe bias that was imposed by the Milky Way template stars up to now hence they reflect well-defined alpha/Fe ratios at all metallicities. They are calibrated with Milky Way globular clusters. The metallicities that we derive are in excellent agreement with the metallicity scale by Zinn & West (1984) and we show that the latter provides total metallicity rather than iron abundance. We can reproduce the relatively strong CN-absorption features CN1 and CN2 of galactic globular clusters with models in which nitrogen is enhanced by a factor three. The index Ca4227 of globular clusters is well matched by our models with [Ca/Fe]= 0.3 including the metal-rich Bulge clusters NGC 6528 and NGC 6553. We define an index that is independent of alpha/Fe and serves therefore best as a tracer of total metallicity. Searching for blue indices that give similar information as Mgb and Fe we find that CN1 and Fe4383 may be best suited to estimate alpha/Fe ratios of objects at redshifts z ˜1.

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