Magnetic fields of red giants and supergiants: a review of spectropolarimetric observations

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Published: Nov 11, 2021
Abstract views: 310
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DOI: https://doi.org/10.31059/aat.vol3.iss1.pp6-11
Keywords:
stars: late-type stars: magnetic fields stars: giants stars: supergiants

Main Article Content

Sergei Plachinda
Crimean Astrophysical Observatory, Nauchny, 298409
Varvara Butkovskaya
Crimean Astrophysical Observatory, Nauchny, 298409
Denis Shulyak
Instituto de Astrof´ısica de Andaluc´ıa – CSIC, Glorieta de la Astronom´ıa s/n, 18008 Granada, Spain
Nikolai Pankov
Crimean Astrophysical Observatory, Nauchny, 298409
Vadim Tsymbal
Institute of Astronomy of the Russian Academy of Sciences, Pyatnitskaya str. 48, 119017 Moscow, Russia

Abstract

Today, magnetic fields have been reliably detected in many classes of stars with convective envelopes, from young T~Tauri stars to supergiants. We present an overview of the results obtained with high-precision spectropolarimetric observations of selected single F0-M0 giants and supergiants. The measurements of the magnetic field in these objects were started in 1989 at the 2.6-meter ZTSh telescope of the Crimean Astrophysical Observatory. To date, weak magnetic fields have been recorded in nearly four dozen of slowly rotating red giants. The longitudinal component of the field in several cases reaches a few tens of gauss. A spectropolarimetric survey of red supergiants includes three dozen objects. The magnetic field was detected in dozen of them. For one of these targets, $\epsilon$~Gem, the magnetic field up to 10~G was reported. Because the magnetic field is frozen into the plasma, it is expected that the magnetic field of giants and supergiants should not exceed one gauss because stars have increased in size after the main sequence. Therefore, the main conclusion from the results of spectropolarimetric surveys of giants and supergiants with convective envelopes is that the most probable mechanism for the generation and amplification of the magnetic field in these objects is the dynamo action.

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How to Cite
Plachinda S., Butkovskaya V., Shulyak D., et al., 2021. Acta Astrophysica Taurica, vol. 3, no. 1, pp. 6–11. DOI: 10.31059/aat.vol3.iss1.pp6-11
Issue
Vol. 3 No. 1 (2022)
Section
Magnetism and activity of the Sun and stars – 2021 Conference proceedings
Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

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