Abundances in LMC and SMC Globular Clusters

Details Abundances in LMC and SMC Globular Clusters Abundances in LMC and SMC Globular Clusters

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..200j&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 present abundances for four old LMC and SMC clusters based on high-resolution spectra of 2-3 red giants per cluster taken with the Magellan telescope. We find that in the two clusters close to the LMC bar NGC 1898 and NGC 2019 the [Si/Fe] ratio is enhanced by ~0.5 dex relative to solar while [Ca/Fe] and [Ti/Fe] are between 0.0 and 0.2 dex similar to what is seen in the inner halo Milky Way clusters. In contrast [Ca/Fe] is 0.3 dex in the outer LMC cluster Hodge 11 and the SMC cluster NGC 121 which is the canonical value for the old outer halo Milky Way clusters. The [Fe/H]'s found are in good agreement with those previously derived from the slopes of the red giant branches. Finally the [Fe/H] and [alpha/Fe] ratios are compared to the results from integrated spectra of these clusters.

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