Which pre-main-sequence phase is marked by strong stellar winds and bipolar outflows?
Answer
T Tauri phase
Before reaching the stable hydrogen-burning state, a contracting object like a solar-mass star passes through recognizable substages, including the T Tauri phase. This stage is characterized by energetic activity, specifically the generation of powerful stellar winds and the ejection of material along bipolar outflows. These winds play a functional role in the star's development by effectively sweeping away the thick envelope of remaining gas and dust that had cocooned the developing protostar, finally allowing visible light from the increasingly hot interior to escape into space.
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