Observations of OH and H2O Maser Emission in the Star-Forming Region S128

被引：3
|
作者：
Ashimbaeva, N. T. [1 ]
Colom, P. [2 ]
Lekht, E. E. [1 ]
Pashchenko, M. I. [1 ]
Rudnitskii, G. M. [1 ]
Tolmachev, A. M. [3 ]
机构：
[1] Lomonosov Moscow State Univ, Sternberg Astron Inst, Moscow 119992, Russia
[2] Univ Paris Diderot, LESIA, Observ Paris Meudon, CNRS,UPMC, F-92195 Meudon, France
[3] Russian Acad Sci, Lebedev Phys Inst, Ctr Astro Space, Pushchino Radio Astron Observ, Pushchino 142290, Moscow Oblast, Russia
来源：
ASTRONOMY REPORTS | 2018年 / 62卷 / 09期
关键词：
D O I：
10.1134/S1063772918090019
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Results of monitoring hydroxyl and water masers in the star-forming region S128 are presented. A large number of emission features in the 1665 MHz OH line have been detected in both circular polarizations. In spite of the strong variability of the flux density in the main 1665 MHz line, the radial velocities of the features remained constant. Zeeman splitting of the 1720MHz line equal to 0.86 km/s was detected, corresponding to a longitudinal magnetic field of 3.6 mG. The variability of the (HO)-O-2 emission has a cyclic character with a quasi-period of 4-14 yrs. The evolution of individual features confirms that the (HO)-O-2 sources A and B are associated with an ionization front between two colliding CO clouds, and shows that the activity was transferred from maser B to maser A in 1999-2001.
引用
收藏
页码：609 / 622
页数：14
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