For the PP chain 0.7% of the mass participating in nuclear fusion is liberated as energy whichproduces a star's luminosity. Assume that the core of a main sequence star consists of 10% of itstotal mass. Hence, estimate the lifetime of a star on the main sequence in terms of its luminosityL/L. Give your answer in years. You may use the observed mass-luminosity relation L x M³.5,where M is the star's total mass.Using typical values, calculate estimates for the main sequence lifetime of a KO star and a 05star. Describe briefly why your estimate might be more accurate for K stars compared to O stars.

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Answered: For the PP chain 0.7% of the mass…

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