Long term variability of MIR-spectra of evolved stars

Details Long term variability of MIR-spectra of evolved stars Long term variability of MIR-spectra of evolved stars

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..165l&link_type=abstract

NOAO Proposal ID #2008B-0165

Physics

Scientific paper

Stellar mass loss is a key process in the cosmic cycle, and for low and intermediate mass stars mass loss is concentrated to the Asymptotic Giant Branch (AGB) state. Deriving of a general mass loss law is still hampered by the limited understanding on the mass loss process itself. This proposal aims to shed new light on the question of the continuity of the mass loss and the processes in the circumstellar dust shells. We propose to obtain mid-IR spectra of a sample of AGB stars studied 10 years ago by the ISO satellite to study changes in the shape and strength of the dust features. Dynamical models indicate enhanced dust formation on timescales of several pulsation cycles (years), and previous low resolution ground based studies indeed suggest the existence of such changes. With our observations, using T-ReCS and Michelle at Gemini, we aim to provide a proper description of this phenomenon.

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