Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-08-19
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Accepeted for publication in Astrophysical Journal Letters
Scientific paper
Results from high resolution spectroscopic analysis of HD 77361 are reported. The LTE analysis shows that HD 77361 is a K giant of atmospheric parameters: Teff = 4580 +/- 75 K, log$g$ = 2.5 +/- 0.1, and \xi_{t} = 1.40 +/-0.5 km/s. 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 till 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 RGB luminosity bump phase, HD 77361 shows 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 +/- 0.2M_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.
Reddy Bacham Eswar
Yerra Bharat Kumar
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