Oxygen isotopic abundances in evolved stars. III - 26 carbon stars

Details Oxygen isotopic abundances in evolved stars. III - 26 carbon stars Oxygen isotopic abundances in evolved stars. III - 26 carbon stars

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..294h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 294-304. Research supported by the Naturvetenskapliga

Astronomy and Astrophysics

Astrophysics

64

Carbon Stars, Oxygen Isotopes, Stellar Composition, Stellar Evolution, Astronomical Catalogs, Oxygen 17, Oxygen 18, Stellar Envelopes

Scientific paper

Oxygen isotope ratios have been measured in 21 ordinary N-type carbon stars and in five 13C-rich J-type stars. The ratios in the ordinary N-type stars are 550 ≤ 16O/17O ≤ 4100 and 700 ≤ 16O/18O ≤ 2400. These ratios are much higher than expected and are extremely difficult to explain in terms of present theories of stellar evolution. The J-type stars exhibit ratios 350 ≤ 16O/17O ≤ 850, 16O/18O ratios being very uncertain. Together with nitrogen abundances measured by Lambert et al., these ratios preclude the envelope burning (hot-bottom convection) hypothesis which has been proposed for these stars.

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