A newly identified emission-line region around P Cygni
A newly identified emission-line region around P Cygni
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P Cygni 周围新发现的发射线区域
DOI：
10.1093/mnras/sty2239
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发表时间：
2018
影响因子：
4.8
通讯作者：
H. Maehara
中科院分区：
文献类型：
--
作者：
M. Mizumoto;N. Kobayashi;S. Hamano;Y. Ikeda;S. Kondo;H. Sameshima;N. Matsunaga;K. Fukue;C. Yasui;Natsuko Izumi;H. Kawakita;Kenshi Nakanishi;Tetsuya Nakaoka;S. Otsubo;H. Maehara
本文介绍了利用日本WINERED光谱仪获得的天鹅座P的高分辨率（R = 20000）近红外（9100- 13500 A）长缝光谱。在所获得的光谱中，我们发现[Fe II]发射线的速度分布在速度为220 km s−1处被分解为两个峰，中间有一个中等的倾角，在220 km s−1处有额外的子峰。长狭缝阶梯光栅图证实了次峰值成分起源于已知的半径为1000弧秒的壳层，该壳层最初是由公元1600年的爆发产生的。另一方面，占天鹅座P [Fe II]通量主导地位的220 km s−1分量被发现集中在更靠近中心星星的地方，其表观空间范围为233角秒。这个范围远大于氢、氦和金属允许谱线所描绘的致密（<0.1弧秒）区域。扩展发射线区域的速度、估计质量和动力学时间表明，该区域是恒星风区域的外部。我们认为，新发现的发射线区域可能是由于恒星风超越爆发壳层而产生的反向激波。
We present a high-resolution (R ≃ 20 000) near-infrared (9100–13 500A) long-slit spectrum of P Cygni obtained with the newly commissioned WINERED spectrograph in Japan. In the obtained spectrum, we have found that the velocity profiles of the [Fe II] emission lines are resolved into two peaks at a velocity of ≃220 km s−1 with a moderate dip in between and with additional sub-peaks at ≃±100 km s−1. The sub-peak component is confirmed with the long-slit echellogram to originate in the known shell with a radius of ≃10 arcsec, which was originally created by the outburst in 1600 AD. On the other hand, the ≃220 km s−1 component, which dominates the [Fe II] flux from P Cygni, is found to be concentrated closer to the central star with an apparent spatial extent of ≃3 arcsec. The extent is much larger than the compact (<0.1 arcsec) regions traced with hydrogen, helium, and metal permitted lines. The velocity, estimated mass, and dynamical time of the extended emission-line region suggest that the region is an outer part of the stellar wind region. We suggest that the newly identified emission-line region may trace a reverse shock due to the stellar wind overtaking the outburst shell.
利用自适应光学系统的差分光谱成像直接观测鲸鱼座的扩展分子大气
DOI：
--
发表时间：
2009
期刊：
PASJ
影响因子：
--
作者：
Takami;H.;Goto;M.;Gaessler;W.;他
通讯作者：
他