Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5906m&link_type=abstract
American Astronomical Society, AAS Meeting #211, #59.06; Bulletin of the American Astronomical Society, Vol. 39, p.842
Astronomy and Astrophysics
Astronomy
Scientific paper
In the late stages of stellar evolution, intermediate mass stars (0.8 - 8 solar masses) follow a path on the Hertsprung Russell diagram up the asymptotic giant branch (AGB), these stars suffer intensive mass loss which leads to the formation of a circumstellar shell (s) of gas and dust shell. This dust is important for the evolution of AGB stars and for the chemical enrichment of Galactic environments. At the end of the AGB phase, mass loss stops and the circumstellar shell begins to drift away from the star. We present Infrared Space Observatory (ISO) far infrared images and radial emission profiles of the extremely extended dust emission from the circumstellar shells of oxygen-rich AGB and post-AGB stars. We further analyze the circumstellar dust emission by estimating the total mass of the dust in the extended shells, and thus place a lower limit on the mass of the progenitor star. Our results indicate dust temperatures of 20K -- 100K with emissivity laws with 0.8 < beta < 1.9 derived from the extended emission through multi-wavelength observations at 50 um, 60 um, 90 um and 160 um seen by ISO in the far infrared. Our calculations produces dust mass estimates of 0.01 - 0.5 solar masses, which indicates the progenitor masses ≤ 3 solar masses.
Menzi Mchunu Basil
Speck Angela Karen
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Simo Mqadi
Well presented paper and very informative about the world.
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