I'm reading up on stellar evolution and I can find lots of details about the timescales of lots of different parts, but nothing specific for how long the transition between protostar and main sequence star takes. The most specific thing I can find is that this happens "relatively quickly", but as we're talking about a timescale of millions of years, that's not particularly precise.
My question is, if you were an observer of a protostar which had just reached 10 million Kelvin and therefore was just on the brink of beginning fusion, how long would it be, approximately, before you could say that the object you're looking at was no longer a protostar but was instead a main sequence star? In other words, how long does the ignition phase of a star last?
My question is, if you were an observer of a protostar which had just reached 10 million Kelvin and therefore was just on the brink of beginning fusion, how long would it be, approximately, before you could say that the object you're looking at was no longer a protostar but was instead a main sequence star? In other words, how long does the ignition phase of a star last?
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