Final answer:
The mnemonic for spectral classes of stars, which are O, B, A, F, G, K, M, L, T, and Y, is "Oh Be A Fine Girl (Guy), Kiss Me Like That, Yo!" used to memorize the classification sequence based on temperature and spectral properties.
Step-by-step explanation:
The question refers to a mnemonic for remembering the spectral classes of stars which are described by the letters O, B, A, F, G, K, M, L, T, and Y. A popular mnemonic to recall these classes is "Oh Be A Fine Girl (Guy), Kiss Me Like That, Yo!" This phrase helps students and astronomers remember the sequence O, B, A, F, G, K, M, L, T, and Y, which categorizes stars based on their temperature and other spectral characteristics.