Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293..273k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 293, June 1, 1985, p. 273-280.
Astronomy and Astrophysics
Astrophysics
136
Carbon Stars, Mira Variables, Stellar Composition, Stellar Envelopes, Stellar Mass Ejection, Variable Stars, Carbon Monoxide, Cosmic Dust, Gas Transport, Interstellar Matter
Scientific paper
The gas and grain loss rates have been calculated for a sample of 40 evolved giant stars, consisting of 18 carbon stars and 22 oxygen-rich (OH/IR and Mira) stars, for which good observations exist. The analysis shows that the gas-to-dust ratio is roughly constant in circumstellar envelopes, with values of ˜ 160 by mass for oxygen-rich stars and ˜ 400 by mass for carbon-rich stars, over a wide range of mass-loss rates. The gas-to-dust ratio in the Galaxy thus appears to be determined by the available heavy element abundances. The carbon stars form a very homogeneous population; the available data suggest progenitor masses for these stars of ˜ 2 Msun.
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