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(σ_Φ) = 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.

中文翻译：

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Herbig Ae / Be星磁场的演变

分析Herbig Ae / Be恒星的磁场测量值，以确定均方根磁场强度\（\ mathcal {B} \）（以G为单位）和磁通量Φ（以G cm ^2为单位）的分布函数。Herbig星与测量的磁场。的\（\ mathcal {B} \）和Φ值由数正态分布函数来近似的手段等于<日志\（\ mathcal {B} \） > = 2.0和日志<ΦΦ> = 25.5，分别且宽度为\（{\ rm {log}}（\ sigma）_ \ mathcal {B} = 0.3 \） dex和log（_σΦ）分别为0.4 dex。推断的分布宽度接近于主序（MS）AB型恒星的典型值，而磁场和磁通量的平均对数被证明比相应值低很多（最多一个数量级）。适用于MS星（分别为2.5和26.4）。讨论了这些差异的起源以及中质前MS恒星的磁场演化。