Mass loss from AGB stars in local group galaxies

Details Mass loss from AGB stars in local group galaxies Mass loss from AGB stars in local group galaxies

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20357z&link_type=abstract

Spitzer Proposal ID #20357

Computer Science

Scientific paper

Mass loss from Asymptotic Giant Branch star is important both for stellar evolution and evolution of the interstellar medium. Mass loss rates have been measured for Galactic stars and Magellanic Cloud stars, but no measurements exist for metallicities [Fe/H] < -1. This is a crucial parameter range, because models predict a transition from dust-driven winds at higher metallicity to pulsation-driven at lower metallicity. Recent ground-based observations suggest that this transition may be more complicated: metal-poor oxygen-rich AGB stars show strongly suppressed abundances of dust precursor molecules (SiO), but metal-poor carbon stars show significant enhancements of molecules such as C2H2 and HCN, compared to Galactic stars. This may cause AGB mass loss at low metallicity to be largely dominated by carbon stars, with important imlpications for the dust input into the ISM. Here we propose a survey of luminous AGB stars in a number of nearby galaxies with [Fe/H] < -1. Only Spitzer can detect dust in these stellar populations, and allows to measure measure mass loss rates in this previously unexplored parameter range. We wil compare the measured rates against predictions from Bowen models and from commonly used parametrizations, and test for the occurence of the predicted transition.

Affiliated with

Also associated with

No associations

Rating

Mass loss from AGB stars in local group galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Mass loss from AGB stars in local group galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass loss from AGB stars in local group galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1167095