The Gaia -ESO Survey: Hydrogen lines in red giants directly trace stellar mass (Astronomy and Astrophysics, 2016)

(untitled) - Bergemann, M; Serenelli, A; Schönrich, R; Ruchti, G; Korn, A; Hekker, S; Kovalev, M; Mashonkina, L; Gilmore, G; Randich, S; Asplund, M; Rix, H; et al.