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Magnetic Fields of CP Stars in the Orion OB1 Association. V. Stars of Subgroups (c) and (d)

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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.

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Notes

  1. The MSS instrument web page: https:// www.sao.ru/hq/lizm/mss/en/index.html.

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Funding

The authors thank the Russian Foundation for Basic Research for financial support (RFBR grant no. 20-02-00233 A). The work of IY is supported by the RFBR (grant no. 19-32-60007). Observations with the SAO RAS telescopes are supported by the Ministry of Science and Higher Education of the Russian Federation (including agreement no. 05.619.21.0016, project ID RFMEFI61919X0016).

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Russia

    I. I. Romanyuk, E. A. Semenko, A. V. Moiseeva, I. A. Yakunin & D. O. Kudryavtsev

  2. National Astronomical Research Institute of Thailand, 50180, Chiangmai, Thailand

    E. A. Semenko

  3. St.-Petersburg State University, 199034, St. Petersburg, Russia

    I. A. Yakunin

Authors
  1. I. I. Romanyuk
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  2. E. A. Semenko
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  3. A. V. Moiseeva
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  4. I. A. Yakunin
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  5. D. O. Kudryavtsev
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Correspondence to I. I. Romanyuk.

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Translated by N. Oborina

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Romanyuk, I.I., Semenko, E.A., Moiseeva, A.V. et al. Magnetic Fields of CP Stars in the Orion OB1 Association. V. Stars of Subgroups (c) and (d). Astrophys. Bull. 76, 163–184 (2021). https://doi.org/10.1134/S1990341321020085

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