Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...703l..46k&link_type=abstract
The Astrophysical Journal Letters, Volume 703, Issue 1, pp. L46-L50 (2009).
Astronomy and Astrophysics
Astronomy
7
Stars: Abundances, Stars: Evolution, Stars: Individual: Hd 77361, Stars: Late-Type
Scientific paper
Results from high-resolution spectroscopic analysis of HD 77361 are reported. LTE analysis shows that HD 77361 is a K giant of atmospheric parameters: T eff = 4580 ± 75 K, log g = 2.5 ± 0.1, and ξt = 1.40 ± 0.5 km s-1. We found that the atmosphere of HD 77361 is highly enriched in Li with log epsilon (Li) = 3.82 ± 0.1. With this finding the total number of super Li-rich K giants (log epsilon(Li) >= 3.3 ISM value) known to date reached six. Contrary to first dredge-up, extra-deep mixing and the associated cool bottom processing, and other recent predictions for K giants on the red giant branch (RGB) luminosity bump phase, HD 77361 shows a very low value of 12C/13C = 4.3 ± 0.5, having, simultaneously, very large amount of Li. Also, HD 77361 is the only Population I low-luminosity (log L/L sun = 1.66 ± 0.1) low-mass K giant (M = 1.5 ± 0.2 M sun) among the known super Li-rich K giants that has a very low 12C/13C ratio. Results of HD 77361 further constrain our theoretical understanding of Li enhancement in the atmospheres of RGB stars.
Kumar Yerra Bharat
Reddy Bacham E.
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