Question

which supergiant stars have the same luminosity (brightness)? choose 2 correct answers. polaris antares deneb rigel

Explanation:

On the Hertzsprung - Russell diagram (the given diagram), luminosity is plotted on the y - axis. To find supergiant stars with the same luminosity, we look at the vertical position (since luminosity is on the vertical axis). Deneb and Rigel are both supergiants and are at the same vertical level (similar luminosity). Antares is a different vertical level (lower luminosity than Deneb and Rigel in the supergiant category), and Polaris is also at a different vertical level.

Answer:

Deneb, Rigel