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The C-12/C-13 ratio in stellar atmospheres. IX - The cool carbon star V460 Cygni

James F. Dominy, Kenneth H. Hinkle, D. L. Lambert, Donald N. B. Hall, S. T. Ridgway

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Abstract

The isotopic abundance ratio 12C/13C is derived for the cool carbon star V460 Cygni (= DS Pegasi). A new 0.2 A resolution, low-noise (S/N > 200) spectrum of the 7650-8460 A region was obtained with a silicon diode Reticon array. A curve-of-growth analysis of the CN red system lines gives 12C/13C = 30 + 13. An independent analysis was made of CO vibrationrotation lines identified on a 0.08 cm -1 resolution spectrum obtained with a Fourier transform spectrometer. This gave 12C/13C = 35 + 12. A mean value 12C/13C - 32 + 9 is proposed. It is suggested that the 3a process was the primary source of the additional carbon which converted the oxygen-rich progenitor into its present carbon-rich state. Subject headings: stars: abundances - stars: carbon - stars: individual

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The isotopic abundance ratio 12C/13C is derived for the cool carbon star V460 Cygni (= DS Pegasi). A new 0.2 A resolution, low-noise (S/N > 200) spectrum of the 7650-8460 A region was obtained with a silicon diode Reticon array. A curve-of-growth analysis of the CN red system lines gives 12C/13C = 30 + 13. An independent analysis was made of CO vibrationrotation lines identified on a 0.08 cm -1 resolution spectrum obtained with a Fourier transform spectrometer. This gave 12C/13C = 35 + 12. A mean value 12C/13C - 32 + 9 is proposed. It is suggested that the 3a process was the primary source of the additional carbon which converted the oxygen-rich progenitor into its present carbon-rich state. Subject headings: stars: abundances - stars: carbon - stars: individual

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Available abstract

The isotopic abundance ratio 12C/13C is derived for the cool carbon star V460 Cygni (= DS Pegasi). A new 0.2 A resolution, low-noise (S/N > 200) spectrum of the 7650-8460 A region was obtained with a silicon diode Reticon array. A curve-of-growth analysis of the CN red system lines gives 12C/13C = 30 + 13. An independent analysis was made of CO vibrationrotation lines identified on a 0.08 cm -1 resolution spectrum obtained with a Fourier transform spectrometer. This gave 12C/13C = 35 + 12. A mean value 12C/13C - 32 + 9 is proposed. It is suggested that the 3a process was the primary source of the additional carbon which converted the oxygen-rich progenitor into its present carbon-rich state. Subject headings: stars: abundances - stars: carbon - stars: individual

Key concepts: Physics, Astrophysics, Carbon star, Stars, Stellar atmosphere, Carbon fibers, Astronomy, Spectral line

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