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Evolution of Magnetic Fields of Herbig Ae/Be Stars

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Abstract

Magnetic-field measurements for Herbig Ae/Be stars are analyzed to determine the distribution functions of root-mean-squared magnetic field strengths \(\mathcal{B}\) (in G) and magnetic fluxes Φ (in G cm2) for Herbig stars with measured magnetic field. The \(\mathcal{B}\) and Φ values are approximated by log-normal functions with the means equal to 〈log \(\mathcal{B}\)〉 = 2.0 and log 〈Φ Φ〉 = 25.5, respectively, and with the widths of \({\rm{log}}(\sigma)_\mathcal{B}=0.3\) dex and log(σΦ) = 0.4 dex, respectively. The inferred distribution widths are close to the typical values for main-sequence (MS) AB-type stars, whereas the mean logarithms of magnetic fields and magnetic fluxes proved to be significantly (by up to one order of magnitude) lower than the corresponding values for MS stars (2.5 and 26.4, respectively). The origin of these differences and the evolution of magnetic fields for intermediate-mass pre-MS stars are discussed.

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Funding

This study was supported by the Russian Foundation for Basic Research (grant no. 18-52-06004 Az_a).

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Authors and Affiliations

  1. St. Petersburg State University, St. Petersburg, 198504, Russia

    A. F. Kholtygin, E. I. Makarenko & I. M. Tumanova

  2. Main (Pulkovo) Astronomical Observatory, Russian Academy of Sciences, St. Petersburg, 196140, Russia

    O. A. Tsiopa

Authors
  1. A. F. Kholtygin
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  2. O. A. Tsiopa
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  3. E. I. Makarenko
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  4. I. M. Tumanova
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Corresponding author

Correspondence to A. F. Kholtygin.

Additional information

Russian Text © The Author(s), 2019, published in Astrofizicheskii Byulleten’, 2019, Vol. 74, No. 3, pp. 296–302.

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The authors state the absence of conflict of interest.

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Kholtygin, A.F., Tsiopa, O.A., Makarenko, E.I. et al. Evolution of Magnetic Fields of Herbig Ae/Be Stars. Astrophys. Bull. 74, 293–299 (2019). https://doi.org/10.1134/S1990341319030064

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  • DOI: https://doi.org/10.1134/S1990341319030064

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