Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..494h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 2, March 1990, p. 494-503.
Astronomy and Astrophysics
Astrophysics
34
Carbon Monoxide, Cool Stars, Giant Stars, Stellar Envelopes, Stellar Oscillations, Supergiant Stars, Emission Spectra, Near Infrared Radiation, Spectral Resolution, Stellar Color, Stellar Mass Ejection
Scientific paper
The CO line profiles in circumstellar envelopes of cool giants and supergiants are investigated, emphasizing the kinematics. New high spectral resolution data are presented which point to nonspherically symmetric outflows in the envelope of the carbon-rich stars TX Psc and possibly Y CVn. This indicates that the kinematics of envelopes depend sensitively on the pulsation of the star, and that mass loss in supergiants can be rather erratic, resulting in a nonspherical geometry. The influence of stellar infrared emission and pulsational properties on circumstellar CO emission is studied, revealing a correlation between 4.7 micron flux and CO(1-0) temperature for carbon-rich stars. No correlation is found for oxygen-rich and S-type stars. It is found that the relation between pulsational period of Mira variables and outflow velocity of the circumstellar gas may be a step function rather than continuous.
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