# Mg, Al, Si, Ca, Ti, Fe, and Ni abundance for a sample of solar analogues

## TL;DR

This study measures chemical abundances of 38 solar analogues, identifying super metal-rich stars and assessing their suitability for exoplanet searches using high-resolution spectroscopy and detailed abundance analysis.

## Contribution

It provides new detailed chemical abundance measurements for a sample of solar analogues, including confirmation of super metal-rich stars and potential exoplanet host candidates.

## Key findings

- Six stars confirmed as super metal-rich.
- BD+60 600 is the most metal-rich star in the sample.
- BD+60 600 and BD+28 3198 are promising for exoplanet searches.

## Abstract

We report on the determination of chemical abundances of 38 solar analogues, including 11 objects previously identified as super metal-rich stars. We have measured the equivalent widths for 34 lines of 7 different chemical elements (Mg, Al, Si, Ca, Ti, Fe, and Ni) in high-resolution ($\mathcal{R} \sim 80\,000$) spectroscopic images, obtained at the Observatorio Astrof\'isico Guillermo Haro (Sonora, Mexico), with the Cananea High-resolution Spectrograph. We derived chemical abundances using ATLAS12 model atmospheres and the Fortran code MOOG. We confirmed the super metallicity status of 6 solar analogues. Within our sample, BD+60 600 is the most metal-rich star ([Fe/H]=+0.35 dex), while for HD 166991 we obtained the lowest iron abundance ([Fe/H]=$-0.53$ dex). We also computed the so-called [Ref] index for 25 of our solar analogues, and we found, that BD+60 600 ([Ref]=+0.42) and BD+28 3198 ([Ref]=+0.34) are good targets for exoplanet search.