Spectroscopic metallicities of Vega-like stars

TL;DR

This study measures the metallicities of 113 Vega-like stars using spectroscopic methods and finds they are similar to field stars, contrasting with the metal-rich nature of exoplanet host stars.

Contribution

It provides the first comparative metallicity analysis of Vega-like stars, exoplanet hosts, and field stars using two spectroscopic techniques.

Findings

Vega-like stars have metallicities similar to field stars.

Exoplanet host stars are more metal-rich than field stars.

Vega-like stars do not show the metallicity enhancement seen in planet-hosting stars.

Abstract

Aims: To determine the metallicities of 113 Southern Hemisphere Vega-like candidate stars in relation to the Exoplanet host group and field stars. Methods: We applied two spectroscopic methods of abundance determinations: equivalent width measurements together with the ATLAS9 (Kurucz 1993) model atmospheres and the WIDTH9 program, and a comparison of observed spectra with the grid of synthetic spectra of Munari et al. (2005). Results: For the Vega-like group, the metallicities are indistinguishable from those of field stars not known to be associated with planets or disks. This result is quite different from the metallicities of Exoplanet host stars which are metal-rich in comparison to field stars.