What specific stage characterizes the pre-main sequence phase for stars like our Sun, marked by strong stellar winds?

T Tauri star stage

As the protostar continues to contract and heat up, it eventually enters the pre-main sequence phase, shedding the obscuring dusty envelope that surrounded it. For stars comparable to the Sun, this transition period is most commonly identified by the T Tauri star stage. T Tauri stars are identified by their inherent variability in brightness and, significantly, by the presence of strong stellar winds. These winds function like a powerful broom, actively sweeping away the last remnants of the dusty cocoon and gas envelope that had not yet accreted or been blown away, thereby exposing the young stellar object to direct observation and allowing it to approach the conditions needed for main sequence stability.