The gravitational force makes them to attract, and the mass of the small star is 10.87 x 10 ^ 11 kg.
Gravitational force is a force that attracts any two objects with containing mass. It can be said that the gravitational force attractive because it always tries to pull masses together, it never pushes them apart.
Gravitational force is
Fg = Gm1m2/r^2
putting the appropriate values we get
6.7 = (G x 1018 x m2)/105^2
m2 = (6.7 x 105 x 105)/ 6.67 × 10-11 x1018
m2 = 10.87 x 10 ^ 11 kg
Hence the mass of the second object is 10.87 x 10 ^ 11 kg.
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