The C-12/C-13 ratio of the carbon star V460 Cygni revisited

Details The C-12/C-13 ratio of the carbon star V460 Cygni revisited The C-12/C-13 ratio of the carbon star V460 Cygni revisited

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..188l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 1, 1984, p. 188-191.

Other

3

Carbon Stars, Stellar Composition, Astronomical Photography, Carbon Isotopes, Stellar Spectra

Scientific paper

In order to find the reasons for the disagreement between the C-12/C-13 ratios of carbon stars determined by Climenhaga et al. (CHHS) and other authors (Dominy et al.; Olson and Richer; and Johnson et al.), V460 Cygni was reanalyzed using the original data and methods (Minnaert formula) of CHHS. A C-12/C-13 ratio between 22 and 29 is obtained for this star using their original photographic data and methods as compared to the CHHS value of 9. The change in C-12/C-13 ratio is primarily due to an inadequate evaluation of the effects of saturation on the choice of the strength factor K in the Minnaert formula by CHHS. Changing the microturbulent velocity and using a different continuum placement produced only minor changes in the carbon isotope ratio contrary to what has been suggested in the literature.

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