Two stars, Tavarish and Nykos, have the same spectral type. Tavarish is luminosity class V and Nykos is luminosity class I. Which star is bigger? Which star is more luminous? Which star has a hotter surface temperature? Explain your answers.
I have to do this question for my Astronomy class and I am not exactly sure if I am doing it right.
Nykos is bigger because it is luminosity class I which is a Supergiant, right? and Nykos also has the hotter surface temperature because it is the most massive. I think?
and isn't the bigger the star the more luminous it is? So wouldn't Nykos be the answer for all of them?
or am I just completely wrong?
Any help is appreciated!