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TYPES OF STAR

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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

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