Question

What happens to the surface temperature and radius of a star like the Sun as it goes from the main sequence to the red giant branch?

Answer 1

Answer:

Temperature decreases as the radius increases.

Explanation:

According to my research on the evolution of a star, It is said that a red-giant branch is the part before helium ignition occurs during the course of a stars evolution. Based on this information and the information provided within the question, I can say that during the change between the main sequence to the red giant branch, Temperature decreases as the radius increases.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.