Lithium abundance in a sample of solar-like stars

TL;DR

This study measures lithium abundances in 52 solar-like stars using high-resolution spectroscopy, providing new data especially for 41 stars with first-time measurements, and compares results with previous studies.

Contribution

It presents new lithium abundance measurements for 41 stars for the first time and validates these results against existing data, using high-resolution spectra from the CanHiS instrument.

Findings

Two stars stand out: one inside the lithium desert, another with the highest lithium abundance in the sample.

Lithium abundances are consistent with previous studies within uncertainties.

The star with the highest lithium abundance is likely a relatively young star.

Abstract

We report on the determination of the lithium abundance [A(Li)] of 52 solar-like stars. For 41 objects the A(Li) here presented corresponds to the first measurement. We have measured the equivalent widths of the 6708\AA\ lithium feature in high-resolution spectroscopic images ($R \sim 80\,000$), obtained at the Observatorio Astrof\'isico Guillermo Haro (Sonora, Mexico), as part of the first scientific observations of the revitalized Lunar and Planetary Laboratory (LPL) Echelle Spectrograph, now known as the Cananea High-resolution Spectrograph (CanHiS). Lithium abundances were derived with the Fortran code MOOG, using as fundamental input a set of atmospheric parameters recently obtained by our group. With the help of an additional small sample with previous A(Li) determinations, we demonstrate that our lithium abundances are in agreement, to within uncertainties, with other works. Two target objects stand out from the rest of the sample. The star BD+47 3218 ($T_{\rm eff}$ = 6050$\pm$52 K, A(Li) = 1.86$\pm$ 0.07 dex) lies inside the so-called lithium desert in the the A(Li)--$T_{\rm eff}$ plane. The other object, BD+28 4515, has an A(Li) = 3.05$\pm$0.07 dex, which is the highest of our sample and compatible with the expected abundances of relatively young stars.