A Physical Limit to the Magnetic Fields of T Tauri Stars

Abstract

Recent estimates of magnetic field strengths in T Tauri stars yield values $B=1$--$4\mathrm{kG}$. In this paper, I present an upper limit to the photospheric values of $B$ by computing the equipartition values for different surface gravities and effective temperatures. The values of $B$ derived from the observations exceed this limit, and I examine the possible causes for this discrepancy.

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• Magnetic Properties of Young Stars in the TW Hydrae Association
• On the Saturation of Astrophysical Dynamos: Numerical Experiments with the No-cosines flow
• Convective intensification of magnetic flux tubes in stellar photospheres
• The basic role of magnetic field in stellar evolution
• Outbursts of Young Stellar Objects