Calculate Total Energy Radiated by Sun During Evolution

[emilykay]

as the sun evolved it contracted, its internal energy changing fro x to y. what's the total energy radiated, assuming luminosity is comparable with present?


I understand that the rate of change of the internal energy = rate at which energy is radiated away by the star.. but i have been given exact numbers and i don't know what calculations to preform.

any help would be really good. thanks.

 

[Chronos]

Stars, like people, tend to be hot blooded in their youth:
http://arxiv.org/abs/astro-ph/0109051
The first million years of the Sun: A calculation of formation and early evolution of a solar-mass star