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manganese star

A B star, with a surface temperature of 10,000 to 15,000 K whose spectrum shows an unusually high ratio of manganese to iron. This and other chemical anomalies are due to the physical separation of different kinds of ions in the stellar atmosphere. Manganese stars rotate slowly, as Ap stars do, but lack their strong magnetic fields. In their spectra, temperature, and other properties, they are intermediate between Ap stars and Am stars.

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