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Find the radii of the two stars 
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#1
Oct610, 01:25 PM

P: 192

1. The problem statement, all variables and given/known data
From the light and velocity curves of an eclipsing, doublelined spectroscopic binary star system, it is determined that the orbital period is 3.15 yr, and the maximum radial velocities of stars A and B are 5.2 km s^1 and 21.6 km s^1, respectively. Furthermore, the time between first contact and minimum light is tbta = 0.45 days, while the length of the primary minimum is tc tb = 0.52 days. Relative to the maximum brightness, the primary minimum is only 54.8% as bright, while the secondary minimum is 88.1% as bright You may assume the orbits are circular and seen perfectly edge on. Find the ratio of the stellar masses (mA/mB), the sum of the masses (M = mA + mB), and the individual masses (mA and mB). (b) Find the radii of the two stars. Hint: Use the speed of one star relative to the other and the eclipse timings given. 2. Relevant equations v1=(2pie a1)/p r=a(1e^2)/(1+ecos@) m1=(4V1^2*r1)/G [c]3. The attempt at a solution[/b] so becasue its edge on that means inclination angle is 90degrees so thats the real velocity and e = 0 too so just use these formula to find masses right? now for part B would i just the formula r=a(1e^2)/(1+ecos@) to find the radii? checked in book showed this as radii but hint says to use something different i think 


#2
Oct610, 02:35 PM

P: 192

nvm i think i figured it out



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