The process by which the relative abundance of a given chemical element or species in an astrophysical object is increased. For example the increase of the heavy element content of the interstellar me
dium due to stellar evolution.
The process by which the relative abundance of a given chemical element or species in an astrophysical object is increased. For example the increase of the heavy element content of the interstellar me
dium due to stellar evolution.
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 cl
asses 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).