Double-lined spectroscopic binaries in M11

TL;DR

This paper introduces a new spectral analysis method for identifying double-lined spectroscopic binaries in the open cluster M11, effective for rapidly rotating stars, and confirms multiple SB2 candidates with orbital solutions.

Contribution

A novel spectral analysis technique that improves SB2 detection in high-resolution spectra, especially for rapidly rotating stars, validated on M11 cluster data.

Findings

Confirmed five known SB2 candidates

Discovered 19 new SB2 candidates

Derived orbital parameters for three binaries

Abstract

We have developed a new method for spectral analysis of binaries. Our method successfully identifies SB2 candidates from high-resolution Gaia-ESO spectra. Compared to the commonly used cross-correlation function analysis, it works for binaries with rapidly rotating components. We test our method on synthetic and observational spectra of BAFG-stars in the open cluster M 11. We confirm five previously detected SB2 candidates and find 19 new ones. For three SB2 candidates we find circular orbits and obtain dynamical mass ratios.