The First Observation of Circumstellar Nebula of VI Cyg 12
WANG Jun-Jie1, ZHU Zhen-Xi1,2
1National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
2Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008
The First Observation of Circumstellar Nebula of VI Cyg 12
WANG Jun-Jie1;ZHU Zhen-Xi1,2
1National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
2Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008
Abstract： An optical spectroscopic observation was made towards the circumstellar nebula of the supergiant VI Cyg 12, for the first time to our knowledge. Several emission lines appear in the spectrum. Based on the spectra of the star and its circumstellar matter, as well as the IRAS and NVSS data, we conclude that VI Cyg 12 has an expanding shell with an expansion velocity 3100 km s-1 due to strong stellar wind. It is an older star that possibly evolved from a very massive O-type star. The stellar wind and mass loss may take an important part in the evolution of this star.
WANG Jun-Jie;ZHU Zhen-Xi;. The First Observation of Circumstellar Nebula of VI Cyg 12[J]. 中国物理快报, 2003, 20(5): 778-779.
WANG Jun-Jie, ZHU Zhen-Xi,. The First Observation of Circumstellar Nebula of VI Cyg 12. Chin. Phys. Lett., 2003, 20(5): 778-779.
2003, Vol. 20 
