What is the critical mass threshold required for a protostar to become a true star?

Answer

0.08 times the mass of the Sun ($0.08 M_{\odot}$)

The critical threshold for achieving stardom hovers near $0.08$ times the mass of the Sun, which is equivalent to $80$ times the mass of Jupiter. If the protostar accumulates mass above this level, it proceeds to the main sequence.

What is the critical mass threshold required for a protostar to become a true star?
astronomystarprotostarstellar evolutionmass