The population of hot subdwarf stars studied with Gaia I. The catalogue of known hot subdwarf stars

TL;DR

This paper compiles a comprehensive catalogue of 5613 known hot subdwarf stars with multi-band data, aiming to facilitate Gaia-based selection and study of these stars in upcoming data releases.

Contribution

It provides the first extensive, multi-wavelength catalogue of hot subdwarfs with classifications and parameters, prepared for Gaia data integration.

Findings

Catalogue contains 5613 unique hot subdwarf sources.

Multi-band photometry and spectroscopic data compiled for each source.

Methodology developed to identify and remove misclassified objects.

Abstract

In preparation for the upcoming all-sky data releases of the Gaia mission we compiled a catalogue of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalogue contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based proper motions, classifications based on spectroscopy and colours, published atmospheric parameters, radial velocities and light curve variability information. Using several different techniques we removed outliers and misclassified objects. By matching this catalogue with astrometric and photometric data from the Gaia mission, we will develop selection criteria to construct a homogeneous, magnitude-limited all-sky catalogue of hot subdwarf stars based on Gaia data.