Main sequence O stars have convective cores because
A) they fuse hydrogen in the CNO cycle.
B) they fuse hydrogen in the proton-proton chain.
C) they contain mostly hydrogen.
D) they have very cool cores.
E) they have very large magnetic fields.

Question

Quizplus · Accepted Answer

Main sequence O stars have convective cores because they fuse hydrogen in the CNO cycle, which is highly temperature-dependent and leads to a steep temperature gradient, causing convection.

Main Sequence O Stars Have Convective Cores Because