Oh, Be A Fine Girl, Kiss Me!

Mnemonic Device:

• Oh, Be A Fine Girl, Kiss Me!

Variations:

• Oh, Be A Fine Guy, Kiss Me!
• Oh, Be A Fine Gentleman, Kiss Me!

Explanation: to remember the spectral classes in order of decreasing stellar surface temperature

• O-B-A-F-G-K-M
  • (our Sun is class G2)