Insight into the OH polarimetric structure of OH 26.5+0.6
Insight into the OH polarimetric structure of OH 26.5+0.6
复制标题
深入了解 OH 26.5 0.6 的 OH 旋光结构
DOI：
10.1111/j.1365-2966.2010.16840.x
复制
发表时间：
2010
影响因子：
4.8
通讯作者：
P. Diamond
中科院分区：
文献类型：
--
作者：
S. Etoka;P. Diamond
我们提出的第一个观点的极端OH/红外星星OH 26.5+0.6的OH壳层的磁场结构。1993年12月，在1612、1665和1667兆赫的全极化条件下，利用多元素无线电联接干涉仪网络对该物体进行了干涉观测。在1612和1667 MHz处，脉泽斑呈球状分布，而在1665 MHz处，蓝移脉泽峰的辐射集中在恒星位置，红移峰的辐射呈现出东南-西北轴的对称结构。两条主线的线偏振相当微弱，在1665兆赫时为9%至20%，在1667兆赫时为0%至30%。在1612兆赫处，大多数脉泽点呈现出类似的线性偏振范围，尽管在包层最外面的部分达到高达66%的值，这在壳层的南部特别明显。极化矢量的详细分布只能在1612 MHz处获得。极化矢量显示出高度结构化的分布，表明极向磁场相对于视线倾斜40°-60°。对于同样与视线成45° ~ 65 °夹角的长椭球包壳，脉泽光斑的速度分布可以用等速各向同性流出来解释。
We present the first view of the magnetic field structure in the OH shell of the extreme OH/infrared star OH 26.5+0.6. Multi-Element Radio-Linked Interferometer Network (MERLIN) interferometric observations of this object were obtained in 1993 December in full polarization, at 1612, 1665 and 1667 MHz. The maser spots show a spheroidal distribution at both 1612 and 1667 MHz, while at 1665 MHz emission from the blueshifted maser peak is concentrated on the stellar position and the redshifted peak emission exhibits a filamentary structure oriented on a south-east-north-west axis. The linear polarization in both main lines is rather faint, ranging from 9 to 20 per cent at 1665 MHz and from 0 to 30 per cent at 1667 MHz. At 1612 MHz, most maser spots exhibit a similar range of linear polarization although those in the outermost parts of the envelope reach values as high as 66 per cent. This is particularly apparent in the southern part of the shell. The detailed distribution of the polarization vectors could only be obtained at 1612 MHz. The polarization vectors show a highly structured distribution indicative of a poloidal magnetic field inclined by 40°-60° to the line of sight. The velocity distribution of the maser spots with respect to the radial distance is well explained by an isotropic outflow at constant velocity in the case of a prolate-shaped spheroid envelope, also tilted about 45°-65° to the line of sight.