First Detection of 22 GHz H2O Masers in TX Camelopardalis

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Journal of the Korean Astronomical Society Pub Date : 2014-12-29 DOI:10.5303/JKAS.2014.47.6.293
Se-Hyung Cho, Jaeheon Kim, Y. Yun
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引用次数: 9

Abstract

Simultaneous time monitoring observations of H₂O 6 16 -5 23 , SiO J = 1-0, 2-1, 3-2, and 29 SiO v = 0, J = 1-0 lines are carried out in the direction of the Mira variable star TX Cam with the Korean VLBI Network single dish radio telescopes. For the first time, the H₂O maser emission from TX Cam is detected near the stellar velocity at five epochs from April 10, 2013 (o = 3.13) to June 4, 2014 (o = 3.89) including minimum optical phases. The intensities of H₂O masers are very weak compared to SiO masers. The variation of peak antenna temperature ratios among SiO v = 1, J = 1-0, J = 2-1, and J = 3-2 masers is investigated according to their phases. The shift of peak velocities of H₂O and SiO masers with respect to the stellar velocity is also investigated according to observed optical phases. The H₂O maser emission occurs around the stellar velocity during our monitoring interval. On the other hand, the peak velocities of SiO masers show a spread compared to the stellar velocity. The peak velocities of SiO J = 2-1, and J = 3-2 masers show a smaller spread with respect to the stellar velocity than those of SiO J = 1-0 masers. These simultaneous observations of multi-frequencies will provide a good constraint for maser pumping models and a good probe for investigating the stellar atmosphere and envelope according to their different excitation conditions.
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首次探测到TX Camelopardalis中的22 GHz H2O脉泽
利用韩国VLBI网络单碟射电望远镜对Mira变星TX Cam方向的H₂O 6 16 -5 23、SiO J = 1-0、2-1、3-2、29 SiO v = 0、J = 1-0线进行了同步监测观测。首次在2013年4月10日(O = 3.13)至2014年6月4日(O = 3.89)的5个历元(包括最小光学相位)附近探测到TX Cam的H₂O脉泽发射。与SiO脉泽相比,h2o脉泽的强度非常弱。研究了SiO v = 1、J = 1-0、J = 2-1和J = 3-2微波激射器的天线峰值温度比随相位的变化规律。根据观测到的光学相位,研究了h2o和SiO脉泽的峰值速度随恒星速度的变化。在我们的监测期间,h2o脉泽发射发生在恒星速度附近。另一方面,与恒星速度相比,SiO脉泽的峰值速度显示出扩展。SiO J = 2-1和J = 3-2型脉泽的峰值速度对恒星速度的影响比SiO J = 1-0型脉泽小。这些多频率的同步观测将为脉泽泵浦模型提供良好的约束条件,并为研究不同激励条件下的恒星大气和包络层提供良好的探针。
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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