A newly identified emission-line region around P Cygni

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Abstract

We present a high-resolution (R 20 000) near-infrared (9100-13 500) 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.

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