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Homework Help: Lifetime Of Class II Protostar

  1. Oct 28, 2012 #1
    1. The problem statement, all variables and given/known data

    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!
  2. jcsd
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