The Gaia-ESO Survey: Catalogue of H$\alpha$ emission stars
Gregor Traven, Toma\v{z} Zwitter, Sophie Van Eck, Alexis Klutsch,, Rosaria Bonito, Alessandro C. Lanzafame, Emilio J. Alfaro, Amelia Bayo,, Angela Bragaglia, Mar\'ia Teresa Costado, Francesco Damiani, Ettore, Flaccomio, Antonio Frasca, Anna Hourihane, Fran Jimenez-Esteban

TL;DR
This paper presents a comprehensive catalogue and classification of Hα emission line profiles in over 22,000 stars from the Gaia-ESO Survey, analyzing their properties, variability, and morphological types, primarily in young open clusters.
Contribution
It introduces a new automated classification scheme for Hα emission profiles and provides a detailed catalogue with variability analysis for a large stellar sample.
Findings
3765 stars with intrinsic Hα emission identified
Eight distinct morphological categories established
Profiles generally stable over time, with some variability in specific types
Abstract
We discuss the properties of H emission stars across the sample of 22035 spectra from the Gaia-ESO Survey internal data release, observed with the GIRAFFE instrument and largely belonging to stars in young open clusters. Automated fits using two independent Gaussian profiles and a third component that accounts for the nebular emission allow us to discern distinct morphological types of H line profiles with the introduction of a simplified classification scheme. All in all we find 3765 stars with intrinsic emission and sort their spectra into eight distinct morphological categories: single--component emission, emission blend, sharp emission peaks, double emission, P-Cygni, inverted P-Cygni, self--absorption, and emission in absorption. We have more than one observation for 1430 stars in our sample, thus allowing a quantitative discussion of the degree of variability of…
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