Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1710m&link_type=abstract
American Astronomical Society, AAS Meeting #212, #17.10; Bulletin of the American Astronomical Society, Vol. 40, p.532
Astronomy and Astrophysics
Astronomy
Scientific paper
Thermally pulsing asymptotic giant branch (AGB) stars suffer mass loss which leads to the formation of a circumstellar shell of gas and dust. At the end of the AGB phase, mass-loss stops and the circumstellar shell begins to drift away from the star. If the velocity of the AGB wind has been relatively constant, then dust furthest from the star represents the oldest mass loss, while material closer to the star represents more recent mass loss. Hence, the history of mass loss during the AGB phase is imprinted on the dust shell of the post-AGB envelope. By studying the distribution of matter in these circumstellar shells we can gain a better understanding of the mass-loss processes involved in the evolution of these stars. We present the far infrared images of post - AGB stars, from which we derive radial profiles, dust temperatures, as well as the dust spectral index of the emitting species. We also calculate the masses of the circumsteller dust, and therefore set a lower limit to the progenitor masses of these stars.
Menzi Mchunu Basil
Speck Angela Karen
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