论文标题
在两个狼射线星中寻找磁场，并发现WR55中的可变磁场
The search for magnetic fields in two Wolf-Rayet stars and the discovery of a variable magnetic field in WR55
论文作者
论文摘要
尽管有间接证据，例如从光谱变异性和X射线发射，这些恒星中应存在该磁场。 WR恒星正处于进化的高级阶段，失去了氢的信封，但是它们的浓风使恒星核心几乎无法观察到。为了证实对最进化的大型恒星中磁场存在的期望，我们选择了两个WR恒星WR46和WR55，以使用FORS2 Spectropolopolorigetric观测值来搜索磁场的存在。我们实现了WR55中几百个高斯阶的可变平均纵向磁场的正式确定检测。该恒星中的田间检测与环星形rcw78和分子环境有关，对于我们对恒星形成的理解至关重要。对于WR46，未达到3 sigma的现场检测，但是通过保险丝观测值提示的旋转周期为15.5h，测得的场强的变异性可以很好地逐步阶段。
Magnetic fields in Wolf-Rayet (WR) stars are not well explored, although there is indirect evidence, e.g. from spectral variability and X-ray emission, that magnetic fields should be present in these stars. Being in an advanced stage of their evolution, WR stars have lost their hydrogen envelope, but their dense winds make the stellar core almost unobservable. To substantiate the expectations on the presence of magnetic fields in the most-evolved massive stars, we selected two WR stars, WR46 and WR55, for the search of the presence of magnetic fields using FORS2 spectropolarimetric observations. We achieve a formally definite detection of a variable mean longitudinal magnetic field of the order of a few hundred Gauss in WR55. The field detection in this star, which is associated with the ring nebula RCW78 and the molecular environment, is of exceptional importance for our understanding of star formation. No field detection at a significance level of 3sigma was achieved for WR46, but the variability of the measured field strengths can be rather well phased with the rotation period of 15.5h previously suggested by FUSE observations.
