Lithium abundance in a sample of solar-like stars

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 6708Å lithium feature in high-resolution spectroscopic images ($R\sim 80000$), obtained at the Observatorio Astrofísico 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 ($T_{\mathrm{eff}}$ = 6050$\pm$52 K, A(Li) = 1.86$\pm$ 0.07 dex) lies inside the so-called lithium desert in the the A(Li)--$T_{\mathrm{eff}}$ 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.

Accepted for MNRAS main journal. 8 pages and 5 figures

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