Abstract
We discuss an ongoing project on the investigation of magnetic fields of chemically peculiar (CP) stars in the Orion OB1 association. More than 500 polarized spectra for 55 stars have been obtained with the Russian 6‐m telescope. We found eight new magnetic stars in addition to the 20 previously known. The frequency of Ap/Bp stars among normal A and B stars and the frequency of magnetic stars among all Ap/Bp stars decrease with age in the Orion OB1 association.
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