Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448l..41d&link_type=abstract
Astrophysical Journal Letters v.448, p.L41
Astronomy and Astrophysics
Astronomy
30
Stars: Abundances, Stars: Chemically Peculiar, Stars: Evolution, Stars: Late-Type
Scientific paper
High-resolution spectra were used to derive CNO abundances and the 12C/13C ratios for the very Li-rich K giants HD 19745 and HD 39853. O and 12C/13C are also obtained for comparison for the Li-rich K giant HD 787. Results from the literature for other very Li-rich giants were also gathered to allow for a more complete discussion. The three most Li-rich giants known, HD 19745, HD 39853, and HD 95799, with epsilon (Li) >= 3.0, show low 12C/13C values (12C/13C <= 15), requiring an extra-mixing mechanism, whereas HD 9746 and HD 112127 with epsilon (Li) ~ 2.7 show 12C/13C ~ 25, following the standard first dredge-up predictions. The data for these five stars indicate that no clear correlation is found between 12C/13C and epsilon (Li) for the very Li-rich giants. An important conclusion is that, since for the three most Li-rich giants, 12C/13C is low, efficient mixing should have lowered both 12C/13C and Li abundances. The very high Li abundances actually found in these stars call therefore for an independent mechanism enriching the Li.
Barbuy Batriz
da Silva Loureiro L.
de La Reza Ramiro
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