Ap and Bp stars
Chemically peculiar stars of spectral types A and B / From Wikipedia, the free encyclopedia
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Ap and Bp stars are chemically peculiar stars (hence the "p") of spectral types A and B which show overabundances of some metals, such as strontium, chromium, or europium. In addition, larger overabundances are often seen in praseodymium and neodymium. These stars have a much slower rotation than normal for A- and B-type stars, although some exhibit rotation velocities up to about 100 kilometers per second.