Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
A. The star is a member of a binary star system.
B. The star is of spectral type G.
C. The star is of spectral type A.
D. We know the star's luminosity and distance.
Answer:A
Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
A. The star is a member of a binary star system. B. The star is of spectral type G. C. The star is of spectral type A. D. We know the star's luminosity and distance.