The C-12/C-13 ratio in stellar atmospheres. VI - Five luminous cool stars

Details The C-12/C-13 ratio in stellar atmospheres. VI - Five luminous cool stars The C-12/C-13 ratio in stellar atmospheres. VI - Five luminous cool stars

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210..684h&link_type=abstract

Astrophysical Journal, vol. 210, Dec. 15, 1976, pt. 1, p. 684-693. Research supported by the Robert A. Welch Foundation

Astronomy and Astrophysics

Astrophysics

40

Abundance, Atmospheric Composition, Carbon 12, Carbon 13, Cool Stars, M Stars, Stellar Atmospheres, Carbon Monoxide, Cyanides, Giant Stars, K Stars, Late Stars, Mass Ratios, Mira Variables, Molecular Spectra, Supergiant Stars, Variable Stars

Scientific paper

A simple curve-of-growth technique is described for extracting the C-12/C-13 ratio for M stars from high-resolution spectra of CO infrared vibration-rotation lines. The technique is applied to the CO lines at 1.6 and 2.3 microns in spectra of two M supergiants (Alpha Ori and Alpha Sco), two M giants (Alpha Her and Beta Peg), and a Mira-type variable (Chi Cyg). As a check on the CO analysis, the C-12/C-13 ratio is derived from the red CN system at 8000 A for Alpha Sco, Alpha Ori, and Beta Peg. The CO analysis is also applied to the K giant Alpha Boo as a check. The CN and CO results are found to be in general agreement, and the C-12/C-13 ratio in all the examined stars is shown to be considerably lower than the solar-system value. It is suggested that these stars were formed from clouds with a C-12/C-13 ratio of 40 to 89 and that their atmospheres now exhibit an enhancement of C-13 abundance due to internal production and mixing to the surface.

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