Determination of the expansion velocities and mass-loss rates of low metallicity newly discovered Halo carbon stars through CO observations

Details Determination of the expansion velocities and mass-loss rates of low metallicity newly discovered Halo carbon stars through CO observations Determination of the expansion velocities and mass-loss rates of low metallicity newly discovered Halo carbon stars through CO observations

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1295z&link_type=abstract

ATNF proposal M289, Semester: April, 2008

Physics

Galactic, Mopra

Scientific paper

During the AGB phase, stars lose mass at high rates. The effect of metallicity on this mass-loss is poorly known. We expect mass-loss rates and expansion velocities of AGB stars to be lower at low metallicty as the mass-loss is due to radiation pressure on dust grains and less grains are expected. Just one low metallicity carbon AGB star has a known expansion velocity and mass-loss rate, measured through CO. We propose to enlarge this sample by observing 6 to 10 newly discovered Halo carbon stars. These observations are key observations to understand the mass-loss from AGB stars.

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