Question

2. Stellar deflection of light at massive star. What is the expected angular deflection of a distant star's position if its light passes very close to the limb of a 10 solar mass main-sequen star? Note: The radius is linearly proportional to mass for a main sequence star.

Answer 1

A ray near a spherical gravitating mass would travel along a hyperbola, the mass being at the focus and the two asymptotes intersecting at a defelcting angle,   $\alpha = 2 \frac{f M}{c^{2}r}$ where f is gravitation constant, M the mass, c the speed of light and r the shortest distance of ray from the mass. Here M = 10 solar mass.