OBAFGKM - What does OBAFGKM stand for? The Free Dictionary
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Author's Note: These three classes of stars aren't included because their compositions are significantly different than those in the OBAFGKM
The color-difference rating is the number of letters between stars on the well-known OBAFGKM
scale of spectral classification.
For more than a century, the familiar spectral sequence OBAFGKM
has stood firm.
Most stars fall into the familiar OBAFGKM