Ionization structure of the nebula NGC 6857 |
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| Authors: | L N Kondrat’eva F K Rspaev E K Aimuratov |
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| Institution: | 1. Fesenkov Astrophysical Institute, Kazakh Academy of Sciences, Kamenskoe plato, Alma-Ata, 480068, Kazakhstan
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| Abstract: | We present the results of our spectroscopic studies of the nebula NGC 6857 located in a region of current star formation. Data on the surface brightness distribution in the central region of the nebula (～60″ × 60″) in the Hα, Hβ, OIII], 5007 Å, N II], 6548, 6583 Å, S II], 6717, 6731 Å, and He I, 6678 Å lines have been obtained with an angular resolution of ～4.″5 × 4.″5. The zones of maximum surface brightness and the region of maximum gas ionization ratio are located 12″ south of the central star, which may suggest the existence of a second gas ionization source. |
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