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Classification of stars
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•
O B A F G K M
scheme
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Originally in order of H strength – A,B,etc
Above order is for decreasing temperature
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Standard mnemonic:
Oh, Be A Fine Girl
(Guy), Kiss Me
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Use numbers for finer divisions:
A0, A1,
... A9, F0, F1, ... F9, G0, G1, ...
From our text:
Horizons, by Seeds