Computer Science
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3400r&link_type=abstract
Spitzer Proposal ID #3400
Computer Science
Scientific paper
Globular clusters, as aggregates of coeval stars with the same chemical abundance, are the best examples of Simple Stellar Populations and ideal templates for studying the evolution of stellar populations and for a correct interpretation of integrated colors (spectral energy distributions) of distant galaxies, with a crucial impact on cosmology. These templates, however, need to be calibrated over the widest possible wavelength range, from the far UV to the mid-IR, in order to take properly into account the contribution of all stellar components, including the coolest ones that were so far poorly known for lack of adequate observations. We propose to use Spitzer/IRAC imaging to characterize a sample of Local Group globular clusters defined to span a wide range in age and abundance. These clusters are meant to provide a grid of templates for the above purposes. Globular clusters in the LMC and SMC, chosen to span a wide range in age, will be resolved into stars. In the Fornax dwarf spheroidal galaxy, clusters are found with [Fe/H] = -2 yet with widely varying horizontal branch morphology (e.g. mass loss history). We propose also to image a set of globular clusters in M31, selected to span a wide range in abundance and different environmental conditions across the body of the galaxy. In addition to these populations, we propose to image the bulges of M31 and M32, which have been resolved into stars in the near-IR. While not strictly simple stellar populations, the bulges may give insight into similarities and differences between galaxy and globular cluster populations, and will provide an important test and verification in the application of stellar population synthesis models using the new and complete grid of templates we are proposing to assemble.
Cacciari Carla
Federici Luciana
Fusi Pecci Flavio
Origlia Livia
Reitzel David
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