猎户座OB1星协中化学磁性特殊星的旋光光谱
Spectropolarimetry of Magnetic Chemically Peculiar Stars in the Orion OB1 Association
摘要：
我们总结了在猎户座OB 1协会的56个化学奇特（CP）星的分光偏振调查的结果。我们在2013-2021年使用特殊天体物理观测台的6米望远镜BTA统一收集了观测材料。我们确定了14个新的磁CP星的纵向磁场超过约500 G。所研究的样本包含31颗磁星或猎户座OB 1中整个CP人口的55%。我们发现，随着年龄的增长，磁CP星的百分比和磁场强度急剧下降。年轻亚组OB 1b（$\log t=6.23$）的平均纵向磁场确信几乎是老年亚组OB 1a（$\log t=7.05$）和OB 1c（$\log t=6.66$）的3倍。在猎户座星云，一个最年轻的恒星星族（$\log t < 6.0$）的地方，我们只检测到磁场的CP星的20%。这种情况与附近的子组OB 1c中83%的磁性CP星截然不同。我们认为这种效应是由一个非常年轻的人口与赫比格Ae/Be星的签名的显着一部分所造成的观测偏差。我们用于磁测量的技术和可用数据的质量不允许我们在光谱中具有有限数量的线和发射的恒星的情况下检测弱场。
英文摘要：
We summarise the results of a spectropolarimetric survey of 56 chemically peculiar (CP) stars in the association of Orion OB1. We uniformly collected the observational material with the 6-m telescope BTA of the Special Astrophysical Observatory in 2013-2021. We identify 14 new magnetic CP stars with a longitudinal magnetic field exceeding approximately 500 G. The studied sample contains 31 magnetic stars or 55% of the whole CP population in Orion OB1. We show that the percentage of the magnetic CP stars and the field strength drops sharply with age. The mean longitudinal magnetic field in the young subgroup OB1b ($\log t=6.23$) is confidently almost three times stronger than in the older subgroups OB1a ($\log t=7.05$) and OB1c ($\log t=6.66$). In the Orion Nebula, a place with the youngest stellar population ($\log t < 6.0$), we detect the magnetic field only in 20% of CP stars. Such occurrence drastically differs from 83% of magnetic CP stars in the nearby subgroup OB1c. We consider this effect an observational bias caused by a significant portion of a very young population with the signatures of Herbig Ae/Be stars. The technique we used for magnetic measurements, and the quality of available data do not allow us to detect weak fields in the case of stars with a limited number of lines and emissions in spectra.
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