 Early stars of less than 2 M ☉ are called T Tauri stars , while those with greater mass are <unk> <unk> / Be stars . These newly formed stars emit jets of gas along their axis of rotation , which may reduce the angular momentum of the collapsing star and result in small patches of <unk> known as <unk> – <unk> objects . These jets , in combination with radiation from nearby massive stars , may help to drive away the surrounding cloud from which the star was formed . 
