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

2008

Abstract

ABSTRACT 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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