Solar twins in the ELODIE archive

TL;DR

This study analyzed approximately 2800 spectra from the ELODIE archive to identify solar twins by comparing stellar spectra to the Sun using a differential method, and characterized their properties including chemical abundances and age.

Contribution

The paper introduces a purely differential spectral comparison method to identify solar twins and provides detailed stellar parameters for the candidates, notably HIP076114 as the best match.

Findings

Identified HIP076114 as the closest solar twin.

Determined chemical abundances and atmospheric parameters for candidates.

Provided insights into the properties and ages of solar twin candidates.

Abstract

A large dataset of ~2800 spectra extracted from the ELODIE archive was analysed in order to find solar twins. A list of stellar spectra closely resembling the spectrum of the Sun was selected by applying a purely differential method, directly on the fluxes. As solar reference, 18 spectra of asteroids, Moon and blue sky were used. Atmospheric parameters and differential abundances of 8 chemical elements were determined for the solar twin candidates, after a careful selection of appropriate lines. The Li feature of the targets was investigated and additional information on absolute magnitude and age was gathered from the literature. HIP076114 (HD138573) is our best twin candidate, looking exactly like the Sun in all these properties.