The Hertzsprung-Russell (HR) Diagram (AQA A-Level Physics): Flashcards

Absolute magnitude vs spectral class (temp.)

Main sequence, red giants, supergiants, white dwarfs

~90%

Upper right (high luminosity, low temp.)

Bottom left (high temp., low luminosity)

$10^8$ to $10^9$ kg$\cdot$m$^{-3}$

Degeneracy pressure (quantum effect)

Inverse: more massive stars live shorter

Stay at one point (set by mass)

$10^{10}$ years (~10 billion years)