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Table 1.
Main subgroups of CP stars according to Preston (1974).
| ID | Common name | Main characteristics |
|---|---|---|
| CP1 | Metallic-line (Am) stars | Underabundances of Ca and Sc, overabundances of iron-peak and heavier elements |
| CP2 | Magnetic Ap stars | Enhanced Si, Cr, Sr, Eu, or rare earth elements |
| CP3 | HgMn stars | Enhanced Hg, Mn, and other heavy elements |
| CP4 | He-weak stars | Weak He lines |
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