The dust sequence along the AGB

Details The dust sequence along the AGB The dust sequence along the AGB

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3167b&link_type=abstract

Spitzer Proposal ID #3167

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Scientific paper

The evolution of stars on the Asymptotic Giant Branch (AGB) is characterized by substantial mass loss, producing large amounts of circumstellar dust and a dust-driven outflow, which injects the stellar ejecta into the interstellar medium. Here we propose to spectroscopically observe a homogeneous sample of AGB stars in the Galactic bulge with Spitzer-IRS from 5.2 to 38 micron with the aim to study the variations in dust composition for 1 solar mass stars as they evolve along the AGB. The Spitzer-IRS wavelength range 5.2 - 38 micron contains the major spectral features of aluminum oxides, spinel, magnesium-iron oxides as well as those of amorphous and various crystalline silicates. Previous studies have shown these components to be abundant in AGB environments, albeit with highly varying relative abundances. The stars in our sample all originate from 1 solar mass stars, and only differ in their ages along the AGB. Moreover, this sample fully covers the range in AGB mass-loss rates, from the onset of mass loss on the AGB up to the superwind phase. The proposed observations with Spitzer-IRS will be coordinated with ground-based observations to obtain simultaneous information on other stellar parameters (such as pulsational phase). With the proposed observations we can therefore link for the first time the spectral differences in dust composition directly to the age on the AGB. Such observations therefore offer the opportunity to comprehensively study the composition and evolution of the circumstellar dust of a 1 solar mass star as it climbs the AGB. The proposed observations will provide a unique observational baseline for studies of dust evolution in AGB stars in our own and other galaxies.

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