Mass loss from evolved stars. I - Observations of 17 stars in the CO/2-1/ line

Details Mass loss from evolved stars. I - Observations of 17 stars in the CO/2-1/ line Mass loss from evolved stars. I - Observations of 17 stars in the CO/2-1/ line

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..616k&link_type=abstract

Astrophysical Journal, Part 1, vol. 252, Jan. 15, 1982, p. 616-634.

Astronomy and Astrophysics

Astrophysics

262

Carbon Monoxide, Late Stars, Line Spectra, Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection, Carbon Stars, Cosmic Dust, Emission Spectra, Main Sequence Stars, Mira Variables, Molecular Spectra, Optical Thickness, Planetary Nebulae, Radiation Pressure, Stellar Models, Variable Stars

Scientific paper

Observations of 29 evolved stars in the CO J = 2-1 line are reported. For 17 of the stars, CO emission from circumstellar molecular gas is detected. Four of the stars (R Leo, R LMi, RX Boo, and Alpha Ori) are detected as CO sources for the first time. The data are analyzed using a simple approximate model of the molecular emission from a stellar molecular envelope, and values of the mass-loss rate are found. Most of the stellar envelopes are found to be optically thick in the CO lines. The mass loss rates for the carbon stars are seen as too large in many cases to be driven by radiation pressure on dust in the envelope. For the Mira variables and possibly for the S stars, the fraction of the stellar photon momentum corresponding to the observed mass loss rate is found to correlate with the amount of dust in the envelope.

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