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Superfast Line Profile Variability in the Spectra of \(\boldsymbol{\rho}\) Leo: New Results

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Abstract

The results of ultrahigh-time-resolution (\(\Delta T\sim 12\) s) observations of the B1 Iab supergiant \(\rho\) Leo with the 1.25-m telescope at the Crimean Astronomical Station of the SAI MSU are presented. Regular line profile variations with periods of 15–30 min have been revealed. Significant changes in the average line profiles on time intervals of 1–3 days have been detected. Evidence for the existence of short-period line profile variations on time scales of 15–25 min is provided. The nature of the short-period line profile variations is discussed. The possibility of studying the fast variations in the profiles of broad lines (mostly the Balmer hydrogen and He I lines) using low-resolution spectrographs with \(R=1000{-}2000\) at 1–2-m telescopes is pointed out.

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Funding

This study was supported by the Russian Foundation for Basic Research (project no. 19-02-00311 A). We are grateful to the referee of the remarks that contributed to an improvement of the text of the paper.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskaya nab. 7/9, 199034, St. Petersburg, Russia

    A. F. Kholtygin

  2. Sternberg Astronomical Institute, Moscow State University (SAI MSU), Universitetskii pr. 13, 119992, Moscow, Russia

    N. P. Ikonnikova & A. V. Dodin

  3. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, 196140, St. Petersburg, Russia

    O. A. Tsiopa

Authors
  1. A. F. Kholtygin
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  2. N. P. Ikonnikova
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  3. A. V. Dodin
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  4. O. A. Tsiopa
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Correspondence to A. F. Kholtygin.

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Translated by V. Astakhov

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Kholtygin, A.F., Ikonnikova, N.P., Dodin, A.V. et al. Superfast Line Profile Variability in the Spectra of \(\boldsymbol{\rho}\) Leo: New Results. Astron. Lett. 46, 168–176 (2020). https://doi.org/10.1134/S1063773720030020

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