Precise Effective Temperatures of Solar Analog Stars

TL;DR

This study precisely determines the effective temperatures of 62 solar analog stars using Balmer line wing fitting, achieving high accuracy and consistency across multiple methods to improve stellar characterization.

Contribution

The paper introduces a highly accurate method for measuring stellar effective temperatures using Balmer line profiles and combines multiple techniques for improved precision.

Findings

Teff values with about 25 K internal errors

Good agreement between different temperature measurement methods

Final Teff values with about 10 K total error

Abstract

We perform a study of 62 solar analog stars to compute their effective temperatures (Teff) using the Balmer line wing fitting procedure and compare them with Teff values obtained using other commonly employed methods. We use observed H-alpha spectral lines and a fine grid of theoretical LTE model spectra calculated with the best available atomic data and most recent quantum theory. Our spectroscopic data are of very high quality and have been carefully normalized to recover the proper shape of the H-alpha line profile. We obtain Teff values with internal errors of about 25 K. Comparison of our results with those from other methods shows reasonably good agreement. Then, combining Teff values obtained from four independent techniques, we are able to determine final Teff values with errors of about 10 K.