2020MNRAS.498...77H

In this work, we show that TYC 8327-1678-1 is a low-mass red giant star with a super lithium abundance in its atmosphere. For this, we used high-resolution spectroscopy to determine atmospheric parameters, the chemical abundances of the light elements and the isotopic ratio ¹²C/¹³C using the spectral synthesis techniques and the equivalent width measurements. Also, we used theoretical evolutionary tracks to find out the mass and the evolutionary stage of TYC 8327-1678-1. The lithium abundance was determined using the Li I resonance doublet at 6708 Å and the subordinate line at 6104 Å that yielding a mean value of logε(Li)_NLTE = 3.48. The projected rotational velocity (v sini) has been determined using spectral synthesis based on the isolated Fe I lines. Our results show that TYC 8327-1678-1 has a mass of M = 1.60±0.20 M_☉, a low rotational velocity (v sini = 2.35 ± 0.24 km s^–1) and metallicity of [Fe/H] = +0.23 ± 0.09. Finally, we discuss the possibility that TYC 8327-1678-1 became a lithium-rich star after a merging event involving a red giant and a helium white dwarf.