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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References
E. Araya, P. Hofner, E. Churchwell, and S. Kurtz, Astrophys. J. Suppl. Ser. 138, 63 (2002).
D. Balser, W. Goss, and C. DePree, Astron. J. 121, 371 (2001).
C. DePree, W. Goss, Z. Palmer, and R. H. Rubin, Astrophys. J. 428, 670 (1994).
Y. Harris, Mon. Not. R. Astron. Soc. 170, 139 (1975).
E. Howard, J. Pipher, W. Forest, and C. G. de Pree, Astrophys. J. 460, 744 (1996).
F. Izrael, Astrophys. J. Suppl. Ser. 236, 465 (1980).
A. V. Kharitonov, V. M. Tereshchenko, and L. N. Knyazeva, Spectrophotometric Catalog of Stars (Kazak Universitet, Almaty, 2011), p. 303 [in Russian].
S. Kurtz, E. Churchwell, and D. Wood, Astrophys. J. Suppl. Ser. 91, 659 (1994).
I. Nosov, Tr. AFI Kaz. AN 38, 18 (1981).
Y. Okamoto, H. Kataza, T. Yamashita, T. Miyata, S. Sako, S. Takubo, M. Honda, and T. Onaka, Astrophys. J. 584, 368 (2003).
E. Peeters, A. Tielens, A. C. A. Boogert, T. L. Hayward, and L. J. Allamandola, Astrophys. J. 620, 774 (2005).
S. Person and J. Frogel, Astrophys. J. 188, 523 (1974).
P. Roelfsema, W. Goss, and T. Geballe, Astron. Astrophys. 207, 132 (1988).
R. Rubin and B. Turner, Astrophys. J. 157, L41 (1969).
R. Rubin and B. Turner, Astrophys. J. 165, 471 (1971).
M. Samal, A. Pandey, D. Ojha, S. K. Ghosh, V. K. Kulkarni, N. Kusakabe, M. Tamura, B. C. Bhatt, M. A. Thompson, and R. Sagar, Astrophys. J. 714,1015 (2010).
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Original Russian Text © L.M. Kondrat’eva, F.K. Rspaev, E.K. Aimuratov, 2014, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2014, Vol. 40, No. 11, pp. 774–782.
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Kondrat’eva, L.N., Rspaev, F.K. & Aimuratov, E.K. Ionization structure of the nebula NGC 6857. Astron. Lett. 40, 704–712 (2014). https://doi.org/10.1134/S1063773714110024
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DOI: https://doi.org/10.1134/S1063773714110024