Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7308
Title: Two New Super Li-rich Core He-burning Giants: A New Twist to the Long Tale of Li Enhancement in K Giants
Authors: Bharat Kumar, Y
Singh, R
Reddy, B. E
Zhao, G
Keywords: Stars: abundances;Stars: evolution;Stars: individual (KIC2305930, KIC12645107);Stars: late-type;Stars: low-mass
Issue Date: 10-May-2018
Publisher: IOP Publishing
Citation: The Astrophysical Journal Letters, Vol. 858, No. 2, L22
Abstract: In this Letter we report two new super Li-rich K giants, KIC2305930 and KIC12645107, with Li abundances exceeding that of the interstellar medium (ISM; A(Li) ≥ 3.2 dex). Importantly, both of the giants have been classified as core He-burning red clump (RC) stars based on asteroseismic data from Kepler mission. Also, both of the stars are found to be low mass (M ≈ 1.0 M ⊙), which, together with an evidence of their evolutionary status of being RC stars, implies that the stars have gone through both the luminosity bump and He-flash during their red giant branch (RGB) evolution. The stars' large Li abundance and evolutionary phase suggest that Li enrichment occurred very recently, probably at the tip of the RGB either during He-flash, an immediate preceding event on the RGB, or by some kind of external event such as merger of an RGB star with white dwarf. The findings will provide critical constraints to theoretical models for understanding of Li enhancement origin in RGB stars.
Description: Restricted Access
URI: http://hdl.handle.net/2248/7308
ISSN: 2041-8205
???metadata.dc.rights???: © The American Astronomical Society
???metadata.dc.relation.uri???: https://doi.org/10.3847/2041-8213/aac16f
Appears in Collections:IIAP Publications

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