B[e]超巨星GG船底座的H α分光偏振测量
Halpha spectropolarimetry of the B[e] supergiant GG Carinae
摘要：
目标。我们研究了B[e]超巨星GG Car的星周环境几何。方法.我们目前的观察使用IAGPOL成像偏振仪与Eucalyptus-IFU光谱仪相结合，以获得光谱偏振测量的GG车在两个时代的整个Halpha。利用Q-U图分析了沿发射线的偏振效应。特别地，使用线效应获得的偏振位置角（PA）能够约束盘/包络的对称轴。结果通过分析通量，GG Car的双峰H α线发射相对于我们测量的时间间隔（~43天）内的连续谱有所增加。在这两个时期的Q-U图中，H α周围的退偏振线效应是明显的，证实了来自系统的光是固有偏振的。还观察到PA沿H α的旋转，表明逆时针旋转盘。使用线效应（~ 85度）计算的固有PA在我们的两个时期之间是一致的，这表明了盘的明确定义的对称轴。
英文摘要：
Aims. We study the geometry of the circumstellar environment of the B[e] supergiant star GG Car. Methods. We present observations acquired using the IAGPOL imaging polarimeter in combination with the Eucalyptus-IFU spectrograph to obtain spectropolarimetric measurements of GG Car across Halpha at two epochs. Polarization effects along the emission line are analysed using the Q-U diagram. In particular, the polarization position angle (PA) obtained using the line effect is able to constrain the symmetry axis of the disk/envelope. Results. By analysing the fluxes, GG Car shows an increase in its double-peaked Halpha line emission relative to the continuum within the interval of our measurements (~43 days). The depolarization line effect around Halpha is evident in the Q-U diagram for both epochs, confirming that light from the system is intrinsically polarized. A rotation of the PA along Halpha is also observed, indicating a counter-clockwise rotating disk. The intrinsic PA calculated using the line effect (~85deg) is consistent between our two epochs, suggesting a clearly defined symmetry axis of the disk.
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