论文标题
光谱二进制T托里星V1878 ORI和V4046 SIR的小型磁场
Small-scale magnetic fields of the spectroscopic binary T Tauri stars V1878 Ori and V4046 Sir
论文作者
论文摘要
目标。这项研究的目的是研究两个光谱二进制T托里星V1878 ORI和V4046 SGR的小型磁场。这样做是为了完成这些恒星表面磁场的观察表征，因为到目前为止，仅使用Zeeman多普勒成像（ZDI）研究了它们的大规模磁场。方法。为了研究小规模磁场，使用CFHT的esspadons光谱仪获得的高分辨率档案光谱研究了近红外TI I线的差异Zeeman强化。为了分别研究二元组件，通过考虑在不同轨道阶段进行的观察结果来散布光谱。基于马尔可夫链蒙特卡洛推断的详细极化辐射转移计算，对Zeeman-Monsensized分析进行了分析，处理可能影响光谱作为自由参数的磁场填充因子和其他恒星参数。结果。 V1878 ORI组件的平均磁场强度分别为1.33和1.57 kg。先前对V1878 ORI的ZDI研究恢复了该磁场强度的14％和20％。对于V4046 SGR，磁场强度分别为1.96和1.83 kg。在这种情况下，ZDI检测到总磁场强度的约12％和9％。结论。每个二进制的两个组件从Zeeman强化获得的小规模磁场强度相似。这与使用相同观测值进行的从ZDI研究获得的大规模磁场相反。虽然大型领域看起来可能会有明显不同。这表明磁发电机的效率与两个二进制文件的组件相当，因为大多数能量都是小尺度场的。
Aims. The goal of this study is to investigate the small-scale magnetic fields of the two spectroscopic binary T Tauri stars V1878 Ori and V4046 Sgr. This is done to complete the observational characterisation of the surface magnetic fields of these stars because only their large-scale magnetic fields have been studied with Zeeman Doppler imaging (ZDI) so far. Methods. To investigate the small-scale magnetic fields, the differential Zeeman intensification of near-infrared Ti I lines was investigated using high-resolution archival spectra obtained with the ESPaDOnS spectrograph at the CFHT. In order to study the binary components separately, the spectra were disentangled by considering observations taken at different orbital phases. The Zeeman-intensification analysis was performed based on detailed polarised radiative transfer calculations aided by the Markov chain Monte Carlo inference, treating magnetic field filling factors and other stellar parameters that could affect the spectra as free parameters. Results. The obtained average magnetic field strengths of the components of V1878 Ori are 1.33 and 1.57 kG, respectively. Previous ZDI studies of V1878 Ori recovered about 14 and 20% of this magnetic field strength. For V4046 Sgr, the magnetic field strengths are 1.96 and 1.83 kG, respectively. In this case, about 12 and 9% of the total magnetic field strength was detected by ZDI. Conclusions. The small-scale magnetic field strengths obtained from Zeeman intensification are similar for the two components of each binary. This is in contrast to the large-scale magnetic fields obtained from ZDI investigations, performed using the same observations. While the large-scale field might look significantly different. This indicates that the efficiency of the magnetic dynamo is comparable for the components of the two binaries, because most energy is carreid by the small scale fields.
