To calculate the masses of stars in a binary system, we must measure their
A. spectral types and distance from Earth.
B. absolute magnitudes and luminosities.
C. luminosities and distance from Earth.
D. orbital period and average orbital distance.
Answer:D
To calculate the masses of stars in a binary system, we must measure their
A. spectral types and distance from Earth. B. absolute magnitudes and luminosities. C. luminosities and distance from Earth. D. orbital period and average orbital distance.