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Magnetic Field Structure of He-r Star HD 144941

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Abstract

In the present paper, we study HD 144941, a EHe-r magnetic star with a very strong magnetic field and unique abundance of helium. We determined the magnetic field variability period equal to 6.969 days and proposed the most probable model of the magnetic field structure. The average surface magnetic field \(B_{s}=11\,226\) G, the magnetic field structure can be described by the theoretical magnetic dipole model located in the center of the star. The inclination angle of the dipole axis to the rotation equator plane is unusually great: \(\alpha=65^{\circ}\). The star’s age after the ZAMS is about \(10^{6}\) yr. We suppose that in terms of a very strong magnetic field, the wind ‘‘blows out’’ significant amount of helium to the surface according to the diffusion theory.

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ACKNOWLEDGMENTS

The authors express their deep gratitude to the referee for valuable comments and recommendations, which allowed us to significantly improve the text and the contents of this paper.

The work was carried out within the framework of the state assignment of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) approved by the Ministry of Science and Higher Education of the Russian Federation.

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

    Yu. V. Glagolevskij & V. D. Bychkov

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  1. Yu. V. Glagolevskij
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  2. V. D. Bychkov
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Correspondence to Yu. V. Glagolevskij.

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Translated by N. Oborina

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Glagolevskij, Y.V., Bychkov, V.D. Magnetic Field Structure of He-r Star HD 144941. Astrophys. Bull. 78, 165–173 (2023). https://doi.org/10.1134/S1990341323020025

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