High resolution spectroscopy of CO in the infrared spectra of cool stars - Turbulent velocities and carbon abundance in M-giant stars

Details High resolution spectroscopy of CO in the infrared spectra of cool stars - Turbulent velocities and carbon abundance in M-giant stars High resolution spectroscopy of CO in the infrared spectra of cool stars - Turbulent velocities and carbon abundance in M-giant stars

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156....8t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 8-21.

Astronomy and Astrophysics

Astrophysics

40

Carbon Stars, Cool Stars, Giant Stars, M Stars, Stellar Spectra, Abundance, Astronomical Spectroscopy, Asymptotic Giant Branch Stars, Carbon Monoxide, G Stars, Infrared Spectra, K Stars

Scientific paper

The first overtone band of CO in high resolution, high quality IR spectra obtained for 18 M-giant stars by Fourier transform spectroscopy is presently treated by means of a quantitative stellar spectroscopy method through which microturbulent velocity can be determined with an accuracy better than 20 percent in most stars. The macroturbulent velocity is also determined, from the line width at the optically thin limit. The Gaussian dispersion of the macroturbulent velocity is noted to decrease from G-K giants to M-giants; microturbulent and macroturbulent velocities are therefore anticorrelated in G, K, and M giant stars. CO is found to be a good indicator of C abundance in cool O-rich stars. If M giants are evolved from G-K giant stars, there should be an additional destruction of C during the evolution from the red giant branch to the asymptotic giant branch at the prethermal pulsing phase.

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