Circular polarization of circumstellar water masers around S Per
Circular polarization of circumstellar water masers around S Per
复制标题
S Per 周围星周水脉泽的圆偏振
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Van Langevelde
中科院分区：
文献类型：
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作者：
W. Vlemmings;P. Diamond;Van Langevelde
本文首次报道了环星水脉泽的圆偏振测量。以前的拱星包层磁场估计使用的SiO和OH脉泽偏振观测。SiO脉泽是探测靠近中心星星的高温和高密度区的探测器。OH脉泽的密度和温度都要低得多，通常在星周包层的更远处。在中温中密度区，磁场引起的塞曼分裂是H_2O脉泽（6_16 - 5_23）转动跃迁圆偏振的主要原因。这里推断的磁场与太阳型磁场的r^{-2}依赖性以及磁场与高密度激射区的耦合的预测值吻合得很好。我们还讨论了圆偏振光谱的意外变窄。
We present the first circular polarization measurements of circumstellar H2O masers. Previously the magnetic field in circumstellar envelopes has been estimated using polarization observations of SiO and OH masers. SiO masers are probes of the high temperature and density regime close to the central star. OH masers are found at much lower densities and temperatures, generally much further out in the circumstellar envelope. The detection of the circular polarization of the (6_16 - 5_23) rotational transition of the H2O maser could be attributed to Zeeman splitting due to the magnetic field in the intermediate temperature and density regime. The fields inferred here agree well with predicted values for a combination of the r^{-2} dependence of a solar-type magnetic field, and the coupling of the field to the high density masing regions. We also discuss the unexpected narrowing of the circular polarization spectrum.