YY Orionis star
An extremely young star, preceding even the T Tauri stage. YY Orionis stars are very young, late-type, low-mass stars, still contracting gravitationally and accreting matter from the protostellar cloud. They show inverse P Cygni profiles corresponding to an infall of material at 300–400 km/s directly onto the star.
Related entry• variable stars
Related category• TYPES OF STAR
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact