Supersolar metallicity in G0-G3 main sequence stars with V<15

TL;DR

This study accurately determined the atmospheric parameters of 233 G0-G3 main sequence stars with V<15, revealing 20 new super metal-rich star candidates using spectroscopic analysis and theoretical spectral comparisons.

Contribution

First-time determination of stellar parameters for 213 stars and identification of 20 new super metal-rich star candidates using a spectroscopic and theoretical spectral index method.

Findings

Photospheric parameters determined for 213 stars for the first time.

Identification of 20 new super metal-rich star candidates.

Method validated with asteroid spectra matching Sun parameters.

Abstract

The basic stellar atmospheric parameters (effective temperature, surface gravity and global metallicity) were simultaneously determined for a sample of 233 stars, limited in magnitude ($V<15$) with spectral types between G0 and G3 and luminosity class V (main sequence). The analysis was based on spectroscopic observations collected at the Observatorio Astrof\'isico Guillermo Haro and using a set of Lick-like indices defined in the spectral range of 3800-4800 $\AA$. An extensive set of indices computed in a grid of theoretical spectra was used as a comparison tool in order to determine the photospheric parameters. The method was validated by matching the results from spectra of the asteroids Vesta and Ceres with the Sun parameters. The main results were: i) the photospheric parameters were determined for the first time for 213 objects in our sample; ii) a sample of 20 new super metal-rich stars candidates was found.