Pre-main-sequence stars (not protostars) on the H-R diagram are _____.
A) above and to the right of supergiants
B) below and to the left of the main sequence
C) below and to the left of white dwarfs
D) above and to the right of the main sequence
E) not on the H-R diagram yet

Question

Quizplus · Accepted Answer

Pre-main-sequence stars are stars that have not yet started hydrogen fusion in their cores, but have already contracted to become denser and hotter than protostars. Therefore, they are located above and to the right of the main sequence on the H-R diagram.

Pre-Main-Sequence Stars (Not Protostars) on the H-R Diagram Are _____