Playing CHESS with stars: Opening moves

Abstract

We introduce the CHESS (CHEmical analysis Survey System) pipeline. CHESS is a workflow of automated steps to extract precise, accurate, and complete chemical information from large sets of stellar spectra. The zero point of the atmospheric parameters is anchored by a set of reference stars distributed throughout the parameter space (effective temperature, surface gravity, and metallicity). Multiple instances of differential analyses are used to achieve high precision locally. Some of the steps in the analysis are assisted by unsupervised machine learning algorithms and/or Bayesian inference.