Question

question 4 (1 point)
according to the hr diagram, compared to other groups of stars, the group that has a relatively high luminosity and relatively low temperature is the:
○ a white supergiants
○ b red giants
○ c black dwarfs
○ d white dwarfs

Explanation:

To solve this, we recall the Hertzsprung - Russell (HR) Diagram. White supergiants have high temperature and high luminosity. Red giants have relatively low temperature (so their color is red, as lower temperature stars emit more red light) and relatively high luminosity (they are in a later stage of stellar evolution, fusing helium in their cores and have expanded outer layers which increases their luminosity). Black dwarfs are theoretical, cold (low temperature) and have very low luminosity. White dwarfs have high temperature (they are hot remnants) but low luminosity. So the group with relatively high luminosity and relatively low temperature is red giants.

Answer:

b. red giants