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Two stars in a binary system, are seen edge-on
from Earth. The HB line emitted by Star 1 varies
between 486.162 nm and 486.186 nm, while
that emitted by Star 2 varies between 486.140
nm and 486.208 nm. Assuming the stars are on
a circular orbit, calculate the orbital velocity of
the two stars and their mass ratio. What
additional observational data is required to
determine the mass of the system?

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