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We summarise the results of a spectropolarimetric survey of 56 chemicallypeculiar (CP) stars in the association of Orion OB1. We uniformly collected theobservational material with the 6-m telescope BTA of the Special AstrophysicalObservatory in 2013-2021. We identify 14 new magnetic CP stars with alongitudinal magnetic field exceeding approximately 500 G. The studied samplecontains 31 magnetic stars or 55% of the whole CP population in Orion OB1. Weshow that the percentage of the magnetic CP stars and the field strength dropssharply with age. The mean longitudinal magnetic field in the young subgroupOB1b ($\log t=6.23$) is confidently almost three times stronger than in theolder subgroups OB1a ($\log t=7.05$) and OB1c ($\log t=6.66$). In the OrionNebula, a place with the youngest stellar population ($\log t < 6.0$), wedetect the magnetic field only in 20% of CP stars. Such occurrence drasticallydiffers from 83% of magnetic CP stars in the nearby subgroup OB1c. We considerthis effect an observational bias caused by a significant portion of a veryyoung population with the signatures of Herbig Ae/Be stars. The technique weused for magnetic measurements, and the quality of available data do not allowus to detect weak fields in the case of stars with a limited number of linesand emissions in spectra.

Spectropolarimetry of Magnetic Chemically Peculiar Stars in the Orion OB1 Association