X Mensae (Paperback)

High Quality Content by WIKIPEDIA articles! X Mensae (X Men) is an M-type star in the constellation of Mensa, located at approximately 2250 light years away from the Sun. It has an apparent visual magnitude of approximately 11.4. Although most Class M stars are red dwarfs, the class also hosts most giants and some supergiants such as Antares and Betelgeuse, as well as Mira variables. The late-M group holds hotter brown dwarfs that are above the L spectrum. This is usually in the range of M6.5 to M9.5. The spectrum of an M star shows lines belonging to molecules and all neutral metals but hydrogen lines are usually absent. Titanium oxide can be strong in M stars, usually dominating by about M5. Vanadium oxide bands become present by late M.