
This chapter decribes the evolution of stellar objects after the PMF phase when a young stellar object forms via accretion from its circumstellar cloud. It is difficult, if not impossible, to draw a line between the process of protostellar formation and the evolution of a protostar toward a mature star on the main sequence. The dense central object that forms during the collapse of a cloud core is not yet a star, but it is also not a molecular core anymore.
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