Here's my question:
The figure above plots core temperature vs. density for a sun-like star. The dashed line marks the boundary between nondegeneracy and degeneracy
a. Which letter represents the onset of core helium fusion?
b. Which letter(s) represents a possible location of our Sun on thisplot?
c. Which side of the dashed line (left or right) represents a degenerate core?
d. Which letter best represents SAO244567?
e. During which letter (that is, stage of stellar evolution) does this sun-like star spend the most time?
f. Which letter represents the stage where the star undergoes thermal pulses?
g. The luminosity of this star (increases/decreases) going from A to B
h. The luminosity of this star (increases/decreases) going from D to E
i. Which letter(s) represent the location of the object depicted in the image below?