What is the mnemonic used to remember the spectral classification system ordered by decreasing temperature?
Answer
Oh Be A Fine Guy/Girl Kiss Me
Astronomers use a specific mnemonic device to help recall the formal spectral classification sequence used for ordering stars based on their decreasing surface temperatures. This sequence is O, B, A, F, G, K, M. The mnemonic provided is "Oh Be A Fine Guy/Girl Kiss Me," where each letter corresponds sequentially to the spectral types O, B, A, F, G, K, and M. This system is based on analyzing the absorption lines present in a star's spectrum, offering a precision in temperature gauging that exceeds simple visual estimation.
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