A very high C-12/C-13 ratio in some CH stars - Implications for dredge-up in AGB evolution during the metal-poor ERA

Details A very high C-12/C-13 ratio in some CH stars - Implications for dredge-up in AGB evolution during the metal-poor ERA A very high C-12/C-13 ratio in some CH stars - Implications for dredge-up in AGB evolution during the metal-poor ERA

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252l...1t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

16

Asymptotic Giant Branch Stars, Carbon Stars, Stellar Composition, Abundance, Metallicity, Carbon Isotopic Ratio, Stars: Abundances, Stars: Carbon, Stars: Ch, Stars: Population Ii

Scientific paper

Two classical CH stars, TT CVn and V Ari, show no trace of 13CN feature even though 12CN lines are strong, and we found lower limits of 12C/13C=200-700 for these CH stars. On the other hand, 12C/13C ratios for four CH stars (HD5223, HD30443, HD189711, HD209621) are around 10. Further, C2 lines of the Phillips system are highly enhanced in TT CVn and V Ari as compared with those in the CH stars with low 12C/13C ratio. Thus, CH stars can be divided into two distinct groups: one having very high ratio of 12C/13C with enhanced C2 features and the other low 12C/13C ratio with weak C2 lines. Such a result provides a direct observational test on dredge-up processes in AGB stars of low metallicity, which is relatively well understood by the present theory. For example, V Ari and TT CVn may provide an evidence of the very latest stage of the third dredge-up where envelope mass is sufficiently small so that mixing of fresh 12C produced high 12C/13C as well as high C/H.

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