Which of the following quantities do you need in order to calculate a star's luminosity?
a) apparent brightness
b) Doppler shift of spectral lines
c) color of the star
d) distance to the star
e) a and d
Answer: e) a and d
Which of the following quantities do you need in order to calculate a star's luminosity?
a) apparent brightness
b) Doppler shift of spectral lines
c) color of the star
d) distance to the star
e) a and d
Answer: e) a and d