The mass loss and dust composition of evolved stars in globular clusters

Details The mass loss and dust composition of evolved stars in globular clusters The mass loss and dust composition of evolved stars in globular clusters

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40111s&link_type=abstract

Spitzer Proposal ID #40111

Computer Science

Scientific paper

We propose to observe 39 mass-losing evolved stars in 22 globular clusters with the IRS on the Spitzer Space Telescope. All of the stars in our sample should have similar ages and initial masses. This full sample will allow us to compare oxygen-rich dust spectra from stars spanning the metallicity range 0.0 < [Fe/H] < -2.0. Subsamples will give us a good range of periods of variability for a variety of metallicities, including six sources in Terzan 5 ([Fe/H] = 0.00) and four sources in NGC 6356 ([Fe/H] = -0.50). These observations will help us understand how oxygen-rich dust forms in stellar outflows, how the composition depends on metallicity, and how the metallicity, mass-loss rate, dust formation, and evolution on the asymptotic giant branch (AGB) are interrelated. This IRS GTO proposal requests 18.8 hours of IRS time.

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