You want to find a mass of a star on the main sequence of the H-R diagram. What do you need
A)The star has to be in a visual binary.
B)The star has to be in a spectroscopic binary.
C)You need the star's luminosity.
D)You need the star's absorption spectra.

Question

Quizplus · Accepted Answer

To determine the mass of a star on the main sequence of the H-R diagram, one needs to know its luminosity. This can be inferred from its absolute magnitude, apparent magnitude, and distance. Once this is known, the mass can be determined using the mass-luminosity relationship for main sequence stars. Visual or spectroscopic binaries are not necessary for this calculation. Absorption spectra are useful for determining the composition of a star, but not its mass.

You Want to Find a Mass of a Star on the Main