Gaia Benchmark stars and their twins in the Gaia-ESO Survey
Paula Jofre
TL;DR
This paper reviews the Gaia benchmark stars, their role in calibrating spectroscopic surveys, and introduces a new method to find stellar twins in the Gaia-ESO Survey to assess their representativeness.
Contribution
It presents a new method for identifying stellar twins in the Gaia-ESO Survey and evaluates how well Gaia benchmark stars represent Milky Way stars.
Findings
Benchmark stars effectively calibrate spectroscopic analyses.
Stellar twins help assess the representativeness of benchmark stars.
Distribution analysis shows benchmark stars cover diverse regions of the Milky Way.
Abstract
The Gaia benchmark stars are stars with very precise stellar parameters that cover a wide range in the HR diagram at various metallicities. They are meant to be good representative of typical FGK stars in the Milky Way. Currently, they are used by several spectroscopic surveys to validate and calibrate the methods that analyse the data. I review our recent activities done for these stars. Additionally, by applying our new method to find stellar twins on the Gaia-ESO Survey, I discuss how good representatives of Milky Way stars the benchmark stars are and how they distribute in space.
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