Am star

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A star of spectral type A whose spectrum additionally contains very strong metallic lines (hence the suffix ‘m’) more typical of type F. Am stars are usually members of close binary systems. They rotate more slowly than normal A stars, thereby allowing some elements to sink and some to rise in their atmospheres, and this produces the observed abundance anomalies. Sirius is an Am star.

Subjects: Astronomy and Astrophysics.

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