Magnetic field of CP stars in the Ori OB1 association. I. HD35456, HD35881, HD36313 A, HD36526
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- 作者：I. I. Romanyuk ; E. A. Semenko ; I. A. Yakunin ; D. O. Kudryavtsev…
- 关键词：stars ; magnetic field—stars ; chemically peculiar—stars ; individual ; HD35456 ; HD35881 ; HD36313 A ; HD36526
- 刊名：Astrophysical Bulletin
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：71
- 期：4
- 页码：436-446
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Astronomy, Astrophysics and Cosmology;
- 出版者：Pleiades Publishing
- ISSN：1990-3421
- 卷排序：71
文摘
We present the results of magnetic field measurements of four chemically peculiar (CP) stars, the members of the Orion stellar association OB1. Observations were carried out with the circular polarization analyzer at the Main Stellar Spectrograph of the 6-m telescope. All the studied stars refer to the subtype of Bp stars with weak helium lines. Canadian astronomer E. F. Borra detected a magnetic field in three of them (HD35456, HD36313, and HD36526) from the Balmer line magnetometer observations. HD35881 was observed for the first time for the purpose to search for a magnetic field. We obtained the following results: HD35456 is a magnetic star with longitudinal field variation range from +300 to +650 G and a period of 4.9506 days; HD35881 is possible a new magnetic star, the longitudinal component of which varies from−1 to +1 kGwith a period of 0.6998 days, however, a small number of lines broadened by rotation does not allow us to conduct measurements more accurately; HD36313 is a binary star with the components similar in brightness, the primary component is a magnetic star with broad lines, the magnetic field of the secondary component (the star with narrow lines) was not detected. Measurements in the Hβ hydrogen line showed the variations of the longitudinal component from −1.5 to +2 kG with a period of 1.17862 days; a strong longitudinal field was detected in HD36526 (from 0 to +3000 G) varying with a rotation period of the star of 3.081 days. In all the cases, we observe considerable discrepancies with the data on magnetic fields of these objects obtained earlier.