Abstract
ABSTRACT We have developed a new method for spectral analysis of binaries. Our method successfully identifies double-lined spectroscopic binary (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 with vsin i from 1 to $330~\, {\rm km}\, {\rm s}^{-1}$ in the open cluster M11. 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.
Highlights
M 11 (NGC 6705), known as the Wild Duck Cluster, is an open cluster from the constellation Scutum
We have developed a new method for spectral analysis of binaries
For three SB2 candidates we find circular orbits and obtain dynamical mass ratios
Summary
M 11 (NGC 6705), known as the Wild Duck Cluster, is an open cluster from the constellation Scutum. Dias et al (2021) provides the most recent estimates of the age 294±1.2 Myr, the distance 1889±65 pc and the extinction Av = 1.457 ± 0.051 mag based on Gaia DR2 data (Gaia Collaboration et al 2018). This cluster is used for the internal calibration of the Gaia-ESO spectroscopic survey (Pancino et al 2017), so M 11 stars have many high-resolution observations. Cantat-Gaudin et al (2014) used Gaia-ESO spectra to determine the metallicity of the cluster [Fe/H] = 0.10 ± 0.06 dex and age from 250 to 316 million years (depending on the isochrone model used). In Merle et al (2017, 2020) the authors have used GaiaESO spectra and cross-correlation function analysis to find many single-lined (SB1) and double-lined (SB2) spectroscopic binaries in M 11
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