The Properties of Dust in Population II: Spitzer Survey of the Carina Dwarf

Details The Properties of Dust in Population II: Spitzer Survey of the Carina Dwarf The Properties of Dust in Population II: Spitzer Survey of the Carina Dwarf

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20469o&link_type=abstract

Spitzer Proposal ID #20469

Computer Science

Scientific paper

We propose to use Spitzer to identify the primary sources of stellar mass loss in the Carina dwarf spheroidal galaxy. Carina is unique among resolved stellar populations in that the bulk of its stars are only a few billion years old, yet they have an extreme Population II chemical composition. The spectral energy distributions we derive will characterize, for the first time, the nature and content of dust formed by metal-poor stars as old as the universe was at z~1. As such, our survey will provide a critical component to models that aim to predict the spectra of galaxies at an early epoch. Carina's unique mix of stellar populations also makes it an important testbed for galactic chemical evolution models. Our data will connect the chain of Carina's chemical evolution, as expressed by stellar abundances, with the current output of metals ejected by its asymptotic giant branch stars in the form of dust.

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