How do massive protostars (4 solar masses)evolve on the H-R diagram?
A) Temperature decreases at approximately constant luminosity.
B) Temperature increases at approximately constant luminosity.
C) Luminosity decreases at approximately constant temperature.
D) Luminosity increases at approximately constant temperature

Question

Quizplus · Accepted Answer

Massive protostars (greater than about 3 solar masses) evolve on the H-R diagram by moving to the left at approximately constant luminosity. This means their temperature increases while their luminosity remains roughly the same. This is because massive protostars do not have a fully convective envelope like lower-mass stars, allowing them to contract and heat up at nearly constant luminosity before reaching the main sequence.

How Do Massive Protostars (4 Solar Masses)evolve on the H-R