Which stars show the largest amount of absorption from molecules such as TiO and CN?
A) the least massive main-sequence stars
B) the most massive main-sequence stars
C) only main-sequence stars with masses close to 1 solar mass
D) only red giant stars
E) only A-type stars

Question

Quizplus · Accepted Answer

The least massive main-sequence stars, such as M-type stars, have cooler temperatures that allow molecules like TiO and CN to form and show strong absorption features in their spectra.

Which Stars Show the Largest Amount of Absorption from Molecules