Evidence for sudden moderate mixing events in early M giants

Details Evidence for sudden moderate mixing events in early M giants Evidence for sudden moderate mixing events in early M giants

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281l..37w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 1, p. L37-L40

Astronomy and Astrophysics

Astrophysics

20

Carbon 12, Carbon 13, Giant Stars, M Stars, Mixing Ratios, Stellar Composition, Abundance, Lithium Isotopes, Star Formation, Stellar Models

Scientific paper

We have determined the C-12/C-13 ratio in 8 M giants and combined our data with previous measurements to establish that in early M giants C-12/C-13 = 11.8 +/- 3.8, where 3.8 is the dispersion, not the standard error of the mean. This low ratio, comparable to the ratio in the coolest red giants and clump stars in M67, has been combined with lithium abundances for the same stars, as reported in the literature. The Li abundances range over three orders of magnitude while the C-12/C-13 ratio is virtually constant. We interpret this as due to small sudden mixing processes during the evolution of M giants that brings recently produced Li-7 to the stellar surface, without penetrating to depths at which the C-12/C-13 ratio would be modified.

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