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leonmate
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Homework Statement
I've been working through coursework set from a module called Sun & Stars.
Basically the concept I understand is that there is a theoretical way of estimating the lifetime of a class II protostar as 2x10^6 years. Using this we can estimate the lifetime of class 0 and class I protostars based on their abundance in comparison to class II (if there are 4x as many class II than class I we assume that class II lifetime is 4x longer also).
Just come across the last question which asks:
How is the lifetime of a class II star estimated?
I've been scouring through my notes and the internet but can't seem to find the theory/derivation/whatever it is they used to figure this out!
I can add that a class II protostar is when the nebula/gas cloud collapses into a protostar with a massive optically thick disc which is correlated with the Classical T Tauri phase
Any help/pointers would be great!