| definition |
Main sequence stars of spectral type A or B identified by the presence of anomalously
strong or weak absorption lines of certain elements in their spectra. CP stars have
been divided into four main classes on the basis of their spectra: 1) non-magnetic
metallic-lined (CP1, Am star), magnetic (CP2, Ap star), non-magnetic mercury-manganese
(CP3, HgMn star), and helium-weak (CP4, He-weak star).
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