前MS中等质量恒星的磁性和化石场假说
Magnetism in pre-MS intermediate-mass stars and the fossil field hypothesis
摘要：
今天，关于Ap/Bp星的最大挑战之一是了解它们缓慢旋转的起源和它们的磁场。后者的有利假设是化石场，这意味着磁场存在于不同的演化阶段，特别是在前主序阶段。在主序相位前存在磁场也是解释Ap/Bp星缓慢自转的必要条件。然而，直到最近，基本上没有关于中等质量前主序星（所谓的Herbig Ae/Be星）的磁性的信息。2005年在加拿大-法国-夏威夷望远镜上安装的新的高分辨率分光偏振计ESPaDOnS提供了对Herbig Ae/Be星进行巡天以研究其磁性和自转的必要能力。这些调查导致在8赫比格Ae/Be恒星的磁场的检测和/或确认，质量从2到近15太阳质量。在这篇文章中，我将介绍我们的调查结果，以及它们对磁场和旋转的起源和演化的影响。
英文摘要：
Today, one of the greatest challenges concerning the Ap/Bp stars is to understand the origin of their slow rotation and their magnetic fields. The favoured hypothesis for the latter is the fossil field, which implies that the magnetic fields subsist throughout the different evolutionary phases, and in particular during the pre-main sequence phase. The existence of magnetic fields at the pre-main sequence phase is also required to explain the slow rotation of Ap/Bp stars. However, until recently, essentially no information was available about the magnetic properties of intermediate-mass pre-main sequence stars, the so-called Herbig Ae/Be stars. The new high-resolution spectropolarimeter ESPaDOnS, installed in 2005 at the Canada-France-Hawaii telescope, provided the capability necessary to perform surveys of the Herbig Ae/Be stars in order to investigate their magnetism and rotation. These investigations have resulted in the detection and/or confirmation of magnetic fields in 8 Herbig Ae/Be stars, ranging in mass from 2 to nearly 15 solar masses. In this contribution I will present the results of our survey, as well as their implications for the origin and evolution of the magnetic fields and rotation.
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