Me stars(em-ee ) Cool red stars whose spectra show emission lines of hydrogen in addition to the molecular bands of titanium oxide characteristic of M stars. This occurs in both giant and dwarf (main-sequence) M stars, apparently for different reasons. The giant Me stars are mainly long-period variables, such as Mira stars, whose distended atmospheres are losing matter to space. The emission lines from dwarf Me stars seem to be related to the presence of strong magnetic fields; they are often flare stars.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006