Three Li-rich K giants: IRAS 12327-6523, IRAS 13539-4153, and IRAS 17596-3952

Abstract

We report on spectroscopic analyses of three K giants previously suggested to be Li-rich: IRAS 12327-6523, IRAS 13539-4153, and IRAS 17596-3952. High-resolution optical spectra and the LTE model atmospheres are used to derive the stellar parameters: ($T_{\mathrm{eff}}$, log $g$, [Fe/H]), elemental abundances, and the isotopic ratio ${}^{12}$C/${}^{13}$C. IRAS 13539-4153 shows an extremely high Li abundance of $\log \epsilon$(Li) $\approx$ 4.2, a value ten times more than the present Li abundance in the local interstellar medium. This is the third highest Li abundance yet reported for a K giant. IRAS 12327-6523 shows a Li abundances of $\log \epsilon$(Li)$\approx$ 1.4. IRAS 17596-3952 is a rapidly rotating ($V\sin i$ $\approx$ 35 km s${}^{-1}$) K giant with $\log \epsilon$(Li) $\approx$ 2.2. Infrared photometry which shows the presence of an IR excess suggesting mass-loss. A comparison is made between these three stars and previously recognized Li-rich giants.

17 pages, 6 figures, accepted for AJ

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