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The Environments of the Sun and the Stars pp 231–238Cite as

Magnetic Field and Convection in the Cool Supergiant Betelgeuse

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Part of the book series: Lecture Notes in Physics ((LNP,volume 857))

Abstract

We present the outcome of a highly-sensitive search for magnetic fields on the cool supergiant Betelgeuse. A time-series of six circularly polarized spectra was obtained using the NARVAL spectropolarimeter at Télescope Bernard Lyot (Pic du Midi Observatory (F)), between March and April 2010. Zeeman signatures were repeatedly detected in cross-correlation profiles, corresponding to a longitudinal component of about 1 G. The time-series unveils a smooth increase of the longitudinal field from 0.5 to 1.5 G, correlated with radial velocity fluctuations. We observe a strong asymmetry of Stokes V signatures, also varying in correlation with the radial velocity. The Stokes V line profiles are red-shifted by about 9 km s−1 with respect to the Stokes I profiles, suggesting that the observed magnetic elements may be concentrated in the sinking components of the convective flows.

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Notes

  1. 1.

    The Bernard Lyot Telescope is operated by the Institut National des Sciences de l’Univers of the French Centre National de la Recherche Scientifique.

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Authors and Affiliations

  1. IRAP, CNRS & Université de Toulouse, 14 avenue Edouard Belin, 31400, Toulouse, France

    P. Petit, M. Aurière, A. Morgenthaler, T. Roudier & J.-F. Donati

  2. Institute of Astronomy, Bulgarian Academy of Science, 72 Tsarigradsko shose, 1784, Sofia, Bulgaria

    R. Konstantinova-Antova

  3. Observatoire de Paris, LESIA, 5 Place Jules Janssen, 92190, Meudon, France

    G. Perrin

Authors
  1. P. Petit
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  2. M. Aurière
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  3. R. Konstantinova-Antova
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  4. A. Morgenthaler
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  5. G. Perrin
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  6. T. Roudier
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  7. J.-F. Donati
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Corresponding author

Correspondence to P. Petit .

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Editors and Affiliations

  1. ARTEMIS, Observatoire de la Côte d'Azur, Av N Copernic, Grasse, 06130, France

    Jean-Pierre Rozelot

  2. GEPI, bâtiment Copernic A, Observatoire de Meudon, place Jules Janssen 5, Meudon, 92195, France

    Coralie Neiner

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Petit, P. et al. (2013). Magnetic Field and Convection in the Cool Supergiant Betelgeuse. In: Rozelot, JP., Neiner, C. (eds) The Environments of the Sun and the Stars. Lecture Notes in Physics, vol 857. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30648-8_9

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