Abstract—The paper presents the results of magnetic field measurements of 27 chemically peculiar stars in subgroups (c) and (d) of the Orion OB1 association. In total, more than 140 circularly polarized spectra were obtained and measured in the period from 2013 to 2020. An analysis of the results showed that 13 out of 24 CP stars in subgroup (c) have a magnetic field. At the same time, no field of a significant strength was found in any of the three CP stars in subgroup (d). We found that the occurrence of magnetic stars in subgroup (c), whose average age is approximately 5 Myr, lies in the middle between the occurrence of magnetic stars in subgroups (a) with an age of 10 Myr and (b), whose age is about 2 Myr. Our results indicate a sharp decrease in the occurrence of magnetic CP stars and a simultaneous decrease in their magnetic field with age. The data obtained with the example of the Orion OB1 association generally support the theory of the fossil origin of the magnetic field of chemically peculiar stars; however, the process of the field formation itself can have a number of features manifesting observationally.

摘要——该论文介绍了猎户座 OB1 协会亚群 (c) 和 (d) 中 27 颗化学奇特恒星的磁场测量结果。在 2013 年至 2020 年期间，总共获得并测量了 140 多个圆偏振光谱。对结果的分析表明，亚群 (c) 中的 24 颗 CP 星中有 13 颗具有磁场。同时，在亚组（d）中的三颗CP星中的任何一颗中都没有发现显着强度的场。我们发现子群（c）中平均年龄约为 5 Myr 的磁星的出现位于年龄为 10 Myr 的子群（a）和年龄为 10 Myr 的子群（b）中磁星出现的中间位置。大约是 2 Myr。我们的结果表明磁性 CP 星的出现急剧减少，并且它们的磁场随着年龄的增长而同时减少。以猎户座OB1协会为例得到的数据，普遍支持化学奇特恒星磁场化石起源的理论；然而，场形成的过程本身可以有许多观察表现出来的特征。