Question

which of the following stars is the brightest? * the hertzsprung - russell diagram
blue or blue - white white yellow red - orange red
rigel denab supergiants betelgeuse
zeta eridani north star (polaris) antares
spica canopus
main sequence
regulus algol capella aldebaran
vega mizar arcturus mira
sirius procyon pollux giants
altair
sun alpha centauri a
alpha centauri b
tau ceti
epsilon eridani
sirius b
white dwarfs
procyon b
barnards star
van maanens star
50,000 20,000 10,000 6600 6000 5000 3000
average surface temperature (°c) increasing
increasing absolute magnitude (brightness)
vega
regulus
polaris
rigel

Explanation:

On the Hertzsprung - Russell Diagram, the higher up a star is located on the absolute magnitude (brightness) axis, the brighter it is. Among Vega, Regulus, Polaris, and Rigel, Rigel is positioned highest on the brightness axis.

Answer:

D. Rigel