Abundances in LMC and SMC Globular Clusters
Abstract
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.
- Publication:
-
Highlights of Astronomy
- Pub Date:
- January 2005
- Bibcode:
- 2005HiA....13..200J