Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..251w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, July 20, 1990, p. 251-261. Research supported by NSF and Naturvetenska
Astronomy and Astrophysics
Astronomy
32
Carbon Stars, Emission Spectra, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectra, Carbon Monoxide, Infrared Astronomy, Line Spectra, Optical Properties
Scientific paper
A millimeter-wave survey has been made of bright relatively unobscured, carbon stars, chosen on the basis of their optical properties. Out of 26 program objects, (J = 2-1)CO emission is detected from 15. Most of these had not been previously detected. There are many differences among the observed objects, but one rather interesting trend emerges: a positive correlation, at moderate IR excesses, between the IR dust emission and the expansion velocity of the dense wind. A similar, positive correlation with the mass-loss rate implies that stars with larger mass fluxes also accelerate them to larger velocities. At high-IR excesses, both correlations break down, and the momentum rate may be limited by the momentum rate of the stellar radiation. All these effects could be ascribed to differences in the gas-to-dust ratio, assuming that radiation pressure initiates and accelerates the wind.
Andersson Bengt-Goran
Johnson Hollis R.
Sahai Raghvendra
Wannier Peter G.
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