Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..295c&link_type=abstract
NOAO Proposal ID #2006B-0295
Other
Scientific paper
We propose to obtain high-quality integrated-light spectroscopy for ≥≈100 ancient (older than a few Gyr) star clusters in M33, the only late-type spiral galaxy in the Local Group. Using line index measurements in the well-known Lick system, we will derive accurate velocities, ages, and chemical compositions for essentially all known ancient cluster candidates in this galaxy. Because M33 is a bulgeless system, this galaxy provides a unique opportunity to study for the first time, a ``pristine'' halo star cluster sample for a spiral galaxy, without contamination from a bulge component. Our immediate goals are to: (i) measure the kinematic properties (i.e. rotation, velocity dispersion) of ancient star clusters in M33; (ii) estimate the age and metallicity distributions of the halo M33 cluster system in order to constrain formation scenarios; and (iii) pursue a detailed study of the chemistry (i.e., (alpha)/Fe ratios) of these clusters to understand their formation timescales and how they compare with other ancient cluster systems in the Local Group. This proposal was approved last year; however due to technical difficulties at the MMT (for e.g., a rat-induced electrical fire), we only obtained ~20% of the observations. Here, we request one night with the MMT/Hectospec in order to complete our program.
Chandar Rupali
Goudfrooij Paul
Puzia Thomas
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