Carbon (C-12/C-13) and oxygen (O-16/O-17) isotopic ratios in seven evolved stars

Details Carbon (C-12/C-13) and oxygen (O-16/O-17) isotopic ratios in seven evolved stars Carbon (C-12/C-13) and oxygen (O-16/O-17) isotopic ratios in seven evolved stars

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..810d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 15, 1987, p. 810-818.

Astronomy and Astrophysics

Astrophysics

30

Abundance, Carbon Stars, Late Stars, Oxygen Isotopes, Stellar Composition, Astronomical Catalogs, Asymptotic Giant Branch Stars, Carbon Isotopes, Giant Stars, Stellar Spectra, Stellar Temperature

Scientific paper

The authors have used high-resolution Fourier transform spectrometer data to derive isotopic ratios in seven asymptotic giant branch stars (types MS, S, and SC). The 12C/13C ratios fall within the limits of 24 - 53 for six stars, but the ratio is 4.7 for the SC star WZ Cas, long known as a star having greatly enhanced 13C. For the S stars the 16O/17O ratios lie in the range from 500 to 1000. For the SC stars 16O/17O ratios lie in the range from 75 to 1200. This spread is interpreted as indicating a range in evolutionary history despite the shared characteristics of near-equality of carbon and oxygen abundance.

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