Astronomers classify stars according to surface temperature by assigning a spectral type determined from the spectral lines present in a star’s spectrum. The hottest stars, with the bluest colors, are called spectral type O, followed in order of declining surface temperature by spectral types B, A, F, G, K and M. The traditional mnemonic for remembering this sequence, OBAFGKM, is “Oh Be A Fine Girl/Guy, Kiss Me!” (the sequence of spectral types has recently been extended beyond type M to include spectural types L “love or liar” and T “tommorrow/terror” representing starlike objects___usually brown dwarf stars/planets which are even cooler than stars of spectral type M “marijuana”
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