What is the dense, hot core called that accretes material from the surrounding disk before nuclear fusion begins?

Answer

Protostar

The intense heating effect near the center of the contracting mass creates a dense, hot core known as a protostar, which continues to grow by accreting material from the surrounding disk.

What is the dense, hot core called that accretes material from the surrounding disk before nuclear fusion begins?
astronomygravitynebulastar formation