KIC 9821622: An Interestiong Lithium-Rich Giant in the Kepler Filed

R. PETRUCCI, E. JOFRÉ, L. GARCÍA, M. GOMEZ

Congreso; FOF meeting 2016; 2016

IATE

We report the discovery of a new remarkable lithium-rich giant, KIC 9821622, in the Kepler field that exhibits an unusually large enhancement of α, Fe-peak, and r-process elements. From high-resolution spectra obtained with GRACES at Gemini North, we derived fundamental parameters and detailed chemical abundances of 23 elements from equivalent widths and synthesis analysis. By combining atmospheric stellar parameters with available asteroseismic data, we obtained the stellar mass, radius, and age. The data analysis reveals that KIC 9821622 is a young Li-rich (A(Li)NLTE = 1.80) intermediate-mass giant star located at the red giant branch near the luminosity bump. The evolutionary status of KIC 9821622 suggests that its Li-rich nature is the result of internal fresh Li that is synthesized through the Cameron-Fowler mechanism near the luminosity bump. However, its peculiar composition opens the possibility of external contamination by material enriched by a supernova explosion. Although it is less likely, planet accretion cannot be ruled out.