NIRIN | All About Nirin images
You cannot determine the age of a star based on it's luminosity or spectral class. however, you can make *assumptions*. ob and a stars are massive and will have a. So now, astronomers determine the mass and luminosity of a range of stars in one cluster because it’s easier to determine their overall age. Astronomers often use a plot called. Younger clusters will have greater abundances of heavier elements than older clusters.