1. The problem statement, all variables and given/known data 2 solar type stars are in a close binary system. Each indivual star has an apparent brightness of m = 10 mag. Determine the apparent magnitudes of the combined system of the 2 stars assuming they cannot be resolved as individual objects. Determine the minimum brightness for this eclipsing binary when 100%, 75%, 50% and 25% of the stellar survace are covered during the eclipse. 2. Relevant equations m1 - m2 = -2.5 log(f1/f2) 3. The attempt at a solution m1 - m2 = -2.5 log (f1/f2) 10-10 = -2.5log(f1/f2) f1/f2 =1 f1=f2 m1+2 - m2 = -2.5 log (f1+f2 \ f2) f1 = f2 m1+2 - m2 = -2.5 log (2f1 \ f1) m1+2 - m2 = -2.5 log 2 m1+2 = -2.5log2 + 5 mag m1+2=4.247425011 m1+2 = 4.25 mag Then I'm not sure how to continue from here - any help would be most appreciated!