Ionization structure of the nebula NGC 6857

L. N. Kondrat’eva, F. K. Rspaev, Y. Aimuratov

2014

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DOI 10.1134/s1063773714110024
Data confidence 70 medium
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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 H α , H β , [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.