The following document lists the file abstract/AZIJLSTR_SGR_AGB.abs
from catalogue VI/111.
A plain copy of the file
(without headers/trailers) may be downloaded.
We propose to study circumstellar envelopes in the newly discovered dwarf spheroidal Sgr. It is the nearest extra-galactic system (half the distance to the LMC) and is the only old, metal-poor stellar population where we can study in detail the mass-loss process. The relatively simple star-formation and chemical history will allow us to measure the mass-loss efficiency for a narrow range in metallicity and stellar age, and will provide a crucial comparison sample compared to the younger, more metal-rich Magellanic Clouds. We will carry out mid-infrared photometry to detect circumstellar envelopes and measure the mass-loss rate. We will also observe the two planetary nebulae with SWS, to measure accurate abundances. Both planetary nebulae in Sgr have [WC]-like central stars, indicating an unexpected difference in stellar population with the Galactic halo.