Do the LMC and Milky Way Globular Clusters Share a Common Origin?

Details Do the LMC and Milky Way Globular Clusters Share a Common Origin? Do the LMC and Milky Way Globular Clusters Share a Common Origin?

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..329o&link_type=abstract

NOAO Proposal ID #2002B-0329

Physics

Scientific paper

We propose to measure the O and Fe abundances in six stars of the ancient Large Magellanic Cloud globular cluster NGC 2019, with Phoenix and Gemini South. Current [Fe/H] estimates for NGC 2019, based on the crude techniques of medium-resolution Ca-triplet spectroscopy and CMD- fitting, disagree by 0.6 dex. Studies of the LMC's globular cluster system performed with the Hubble Space Telescope suggest that the LMC and Milky Way old globular clusters could have been drawn from an identical parent population. As globular cluster cluster ages are sensitive to both [Fe/H] and [(alpha)/Fe], accurate Fe and O abundances are needed as proof. In light of the recent VLT measurement of a low O abundance in the old LMC cluster NGC 2210, NGC NGC 2019 is an especially interesting target. Our measurements will establish whether the large variation in [O/Fe] seen within Galactic globular clusters exists in the LMC. Combined with the Phoenix Demo Science data, these data will help to fix the initial conditions for the LMC's chemical enrichment history.

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