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Superfast Line Profile Variations in the Spectra of OBA Stars. III. A0 Star α2 Cvn, New Results

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Abstract—This work is a continuation of the studies of the ultrafast variability of line profiles in the spectra of early-type stars. Line profile variations in the spectrum a chemically peculiar A0Vp star α2 CVn are investigated using the January 6, 2020 observations carried out with the 6-meter BTA telescope at SAO RAS equipped with the MSS spectrograph. Regular short-term periodic variations of the Hβ, FeII, and CrII lines were detected with periods ranging from 4 to 140 minutes. The magnetic field of the star was determined for all observations. The average measured longitudinal magnetic field component over the entire duration of observations is about 600 G, which is close to the value expected from the well-known magnetic field phase curve.

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ACKNOWLEDGMENTS

The authors are grateful to I.I. Romanyuk for advice and recommendations which helped to improve the text of the paper.

Funding

A.Kh. and A.M. acknowledge the support of the RFBR grant 19-02-00311 A. I.Ya. is grateful for the support of this work by the RFBR project no. 19-32-60007. Observations with the SAO RAS telescopes are carried out with the support of the Ministry of Science and Higher Education of the Russian Federation (including agreement no. 05.619.21.0016, unique project identifier RFMEFI61919X0016).

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Authors and Affiliations

  1. Saint Petersburg State University, 199034, Saint Petersburg, Russia

    A. F. Kholtygin & I. A. Yakunin

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

    A. V. Moiseeva & I. A. Yakunin

  3. Leibniz Institute for Astrophysics Potsdam (AIP), 14482, Potsdam, Germany

    S. Hubrig

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  1. A. F. Kholtygin
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  2. A. V. Moiseeva
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  3. I. A. Yakunin
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  4. S. Hubrig
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Correspondence to A. F. Kholtygin.

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Translated by E. Chmyreva

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Kholtygin, A.F., Moiseeva, A.V., Yakunin, I.A. et al. Superfast Line Profile Variations in the Spectra of OBA Stars. III. A0 Star α2 Cvn, New Results. Astrophys. Bull. 75, 284–293 (2020). https://doi.org/10.1134/S1990341320030086

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