The circumstellar H2O maser emission associated with four late-type stars.
The circumstellar H2O maser emission associated with four late-type stars.
复制标题
与四颗晚型恒星相关的星周 H2O 脉泽发射。
DOI：
10.1086/163023
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
P. Bowers
中科院分区：
文献类型：
--
作者：
K. Johnston;J. Spencer;P. Bowers
利用VLA测量了四颗长周期星的H_2O脉泽位置和结构，并对测量结果进行了讨论。观察到的四颗恒星是：RX Boo; R Aq 1; RR Aq 1;和NML Cyg。VLA测量的空间分辨率为0.07 arcsec。H2O脉泽发射特征表现为分布在不超过0.4弧秒的区域上的未分辨的节。发现RAq 1和RR Aq 1脉泽区的速度和空间特征随时间发生了很大的变化。对于RX Boo、R Aq 1和RR Aq 1，H2O脉泽发射的估计大小为8 × 10的14次方。超巨星星星NML Cyg拥有最大的脉泽区域（10的16次方），与VY CMa的脉泽区域相当。个别脉泽特征的位置精度在0.03和0.09角秒之间。然而，脉泽发射相对于恒星光心的精确位置并不适合发射的速度和空间分布，因此可能不适合作为恒星参考系比较的标准。20篇参考文献
The positions and structure of H2O maser associated with four long-period stars were measured using the VLA, and the results are discussed. The four stars observed were: RX Boo; R Aq1; RR Aq1; and NML Cyg. The spatial resolution of the VLA measurements was 0.07 arcsec. The H2O maser emission features appear as unresolved knots distributed over an area of no more than 0.4 arcsec. The velocity and spatial characteristics of the maser regions in R Aq1 and RR Aq1 were found to change considerably over time. The estimated sizes of the H2O maser emission were 8 x 10 to the 14th for RX Boo, R Aq1, and RR Aq1. The supergiant star NML Cyg had the largest maser region (10 to the 16th) which is comparable to that of VY CMa. The positional accuracy for individual maser features ranged between 0.03 and 0.09 arcsec. However, the precise location of the maser emission relative to the stellar photocenter did not fit the velocity and spatial distributions of the emission and therefore may be inappropriate as a standard for comparisons of stellar reference frames. 20 references