The Mass Loss Histories of Hot, Massive Stars Revealed by their Circumstellar Nebulae and Interactions With the ISM

Details The Mass Loss Histories of Hot, Massive Stars Revealed by their Circumstellar Nebulae and Interactions With the ISM The Mass Loss Histories of Hot, Massive Stars Revealed by their Circumstellar Nebulae and Interactions With the ISM

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30544m&link_type=abstract

Spitzer Proposal ID #30544

Physics

Scientific paper

We propose to obtain IRS spectroscopy and IRAC and MIPS imaging of prototype dusty nebulae around Population I Wolf-Rayet stars and hot supergiant progenitors in order to more fully characterize the physical and chemical properties of the dust and nebular gas, and their interactions with the ISM. The mass loss histories of these stars in their relatively short post-Main Sequence phases are not well understood, yet their influences on the dynamics and chemistry in galaxies are profound. We are especially interested in the questions of the thermal processing of the dust that can lead to significant contribution of crystalline silicate material to the ISM, in comparison to galaxies observed to have higher contributions that are ascribed to recent massive starburst activity. The composition of the dust, and nebular abundances are also important to resolving uncertain relationships between the transition phases off the Main Sequence, helping to constrain the evolutionary predictions and testing the latest stellar wind models. The Spitzer instruments are ideally suited to better establishing the physical and chemical roles that these massive nebular winds play in the Galactic medium, focusing on these representative objects which could not be previously studied in detail due to limitations in senstivity and spatial resolution.

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