: Astronomie: Ap-type star

stellar astronomy > stellar type > particular star > chemically peculiar star > Ap-type star

Ap-type star

An Ap star is an A star whose spectrum has unusually strong lines of some ionized metals and rare earth elements, pointing to a vast overabundance (10³to 10⁶solar values) of these elements in the star's surface layers. More generally, the term Ap star, or peculiar A star, has come to encompass a range of chemically anomalous stars roughly between spectral types B5 and F5. The elements in overabundance vary from one Ap star to another and may include manganese, mercury, silicon, chromium, strontium, europium, and others. Ap stars typically have surface temperatures of 8,000 to 15,000 K, strong magnetic fields, and low rotational rates – properties that help explain their observed chemical anomalies. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/A/Astar.html)

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