Category:Hertzsprung–Russell classifications

A

• Asymptotic-giant-branch stars (5 C, 97 P)

B

• Bright giants (7 C, 1 P)
• Brown dwarfs (5 C, 167 P)

D

• Main-sequence stars (8 C, 2 P)

G

• Giant stars (9 C, 5 P)

H

• Hertzsprung gap (6 P)
• Horizontal-branch stars (2 C, 199 P)
• Hypergiants (6 C, 6 P)

P

• Pre-main-sequence stars (3 C, 19 P)

R

• Red dwarfs (2 C, 13 P)

S

• Subdwarfs (6 C, 4 P)
• Subgiant stars (7 C, 6 P)
• Supergiants (10 C, 6 P)

W

• White dwarfs (3 C, 164 P)

• Hertzsprung–Russell diagram
• Stellar classification

B

• Blue loop

H

• Hayashi track
• Henyey track
• Hess diagram

I

• Instability strip

R

• Red-giant branch

S

• Stellar birthline