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New results of magnetic field measurements for BP Tau

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Abstract

We present measurements of the longitudinal magnetic field component B ‖ of the young star BP Tau in the He I 5876 emission line formation region, i.e., in the accretion flow near the stellar surface. The values obtained (≃1.7 kG and ≃1.0 kG in 2000 and 2001, respectively) agree with the results of similar measurements by other authors. At the same time, we show that the previously obtained field strength at the magnetic pole, B p, and the inclination of the magnetic axis to the rotation axis, β, are untrustworthy. In our opinion, based on the B ‖ measurements available to date, it is not possible to conclude whether the star’s magnetic field is a dipole one or has a more complex configuration and to solve the question of whether this field is stationary. However, we argue that at least in the He I 5876 line formation region, the star’s magnetic field is not stationary and can be restructured in a time of the order of several hours. Nonstationary small-scale magnetic fields of active regions on the stellar surface and/or magnetospheric field line reconnection due to the twisting of these field lines as the star rotates could be responsible for the short-term magnetic field variability. It seems highly likely that there are no strictly periodic variations in brightness and emission line profiles in BP Tau due to the irregular restructuring of the star’s magnetic field.

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References

  1. D. R. Ardila and G. Basri, Astrophys. J. 539, 834 (2000).

    Article  ADS  Google Scholar 

  2. H. W. Babcock, Astrophys. J., Suppl. Ser. 3, 207 (1958).

    Google Scholar 

  3. J. Bouvier, S. H. P. Alencar, T. J. Harries, et al., astroph/0603498 (2006).

  4. G. A. Chuntonov, Godovoĭ Otchet Spets. Astrofiz. Obs. Ross. Akad. Nauk 56, 36 (1997).

    Google Scholar 

  5. A. G. Daou, C. M. Johns-Krull, and J. A. Valenti, Astron. J. 131, 520 (2006).

    Article  ADS  Google Scholar 

  6. L. Errico, S. A. Lamzin, and A. A. Vittone, Astron. Astrophys. 377, 557 (2001).

    Article  ADS  Google Scholar 

  7. E. Gullbring, H. Barwig, and J. H. M. M. Schmitt, Astron. Astrophys. 324, 155 (1997).

    ADS  Google Scholar 

  8. E. Gullbring, P. P. Petrov, I. Ilyin, et al., Astron. Astrophys. 314, 835 (1996).

    ADS  Google Scholar 

  9. D. J. Hudson, Statistics for Physicists (Mir, Moscow, 1967) [in Russian].

    Google Scholar 

  10. C. M. Johns-Krull, J. A. Valenti, A. P. Hatzes, and A. Kanaan, Astrophys. J. 510, L41 (1999).

    Article  ADS  Google Scholar 

  11. C. M. Johns-Krull, J. Valenti, S. H. Saar, and A. P. Hatzes, Astron. Soc. Pac. Conf. Ser. 223, 521 (2001).

    ADS  Google Scholar 

  12. R. M. Johnstone and M. V. Penston, Mon. Not. R. Astron. Soc. 219, 687 (1986).

    ADS  Google Scholar 

  13. F. Kupka, N.E. Piskunov, T.A. Ryabchikova, et al., Astron. Astrophys., Suppl. Ser. 138, 119 (1999).

    Article  ADS  Google Scholar 

  14. J. Muzerolle, L. Hartmann, and N. Calvet, Astron. J. 116, 455 (1998).

    Article  ADS  Google Scholar 

  15. V. E. Panchuk, Preprint Spets. Astrophys. Obs. Ross. Akad. Nauk, No. 154 (2001).

  16. N. E. Piskunov, in Proceedings of the 2nd International Workshop on Solar Polarization, Ed. by K. Nagendra and J. Stenflo, Kluwer ASSL 243, 515 (1998).

  17. M. M. Romanova, G. V. Ustyugova, A. V. Koldoba, et al., Astrophys. J. 595, 1009 (2003).

    Article  ADS  Google Scholar 

  18. M. Simon, A. Dutrey, and S. Guilloteau, Astrophys. J. 545, 1034 (2000).

    Article  ADS  Google Scholar 

  19. D. A. Smirnov, S. A. Lamzin, S. N. Fabrika, and G. A. Chuntonov, Pis’ma Astron. Zh. 30, 506 (2004) [Astron. Lett. 30, 456 (2004)].

    Google Scholar 

  20. D. A. Smirnov, M. M. Romanova, and S. A. Lamzin, Pis’ma Astron. Zh. 31, 375 (2005) [Astron. Lett. 31, 335 (2005)].

    Google Scholar 

  21. N. H. Symington, T. J. Harries, and R. Kurosawa, Mon. Not. R. Astron. Soc. 356, 1489 (2005).

    Article  ADS  Google Scholar 

  22. J. A. Valenti, C. M. Johns-Krull, and A. P. Hatzes, in Proceedings of the Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, Ed. by A. Brown, G. M. Harper, and T. R. Ayres (Colorado Univ. Press, Colorado, 2003), p. 729.

    Google Scholar 

  23. Ya. B. Zel’dovich, S. I. Vaĭnshtein, and A. A. Ruzmaĭkin, Turbulent Dynamo in Astrophysics (Nauka, Moscow, 1980) [in Russian].

    Google Scholar 

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhniĭ Arkhyz, 357147, Karachai-Cherkessian Republic, Russia

    G. A. Chuntonov

  2. Sternberg Astronomical Institute, Universitetskiĭ pr. 13, Moscow, 119992, Russia

    D. A. Smirnov & S. A. Lamzin

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  1. G. A. Chuntonov
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  2. D. A. Smirnov
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  3. S. A. Lamzin
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Original Russian Text © G.A. Chuntonov, D.A. Smirnov, S.A. Lamzin, 2007, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2007, Vol. 33, No. 1, pp. 44–51.

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Chuntonov, G.A., Smirnov, D.A. & Lamzin, S.A. New results of magnetic field measurements for BP Tau. Astron. Lett. 33, 38–44 (2007). https://doi.org/10.1134/S1063773707010057

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  • DOI: https://doi.org/10.1134/S1063773707010057

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