Discovery of the first Super-Lithium rich Beat Cepheid: V371 Per

TL;DR

This paper reports the discovery of the first super-Lithium rich Beat Cepheid, V371 Per, with unusual lithium abundance and characteristics suggesting a unique evolutionary status and galactic origin.

Contribution

It presents the first high-resolution spectra analysis of V371 Per, revealing its super-Lithium richness and providing insights into its evolutionary stage and galactic population membership.

Findings

Detection of abnormally strong Li I 6707.76 A line.

Star did not undergo evolutionary dredge-up.

Likely belongs to the thick disc or halo of the Galaxy.

Abstract

Four high-resolution spectra of the double-mode Cepheid V371 Per, obtained for the first time, showed the presence of the abnormally strong Li I 6707.76 A line. Our analysis of the light element abundances indicates that the star did not go through the evolutionary dredge-up stage. Large distance from the galactic plane and the low metallicity suggest that V371 Per may belong to the thick disc (or to the halo) of the Galaxy, which is consistent with its low metallicity [Fe/H]=-0.42 and the enhancement of the alpha- and s-elements relative to iron. Line splitting is observed in one of the spectra, which can be due to the non-radial pulsations.