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Abstract:

We investigate the neutral gas distribution and kinematics in the surroundings of the WR star HD 192163 and the ring nebula NGC 6888, based on H I 21 cm line observations carried out with the Synthesis Telescope of the DRAO. A detailed analysis of the H I distribution at low positive velocities allowed us to identify two different structures very probably related to the star and the ring nebula. From inside to outside they are: (1) an elliptical shell, 11.8×6.3 pc in size, that embraces the ring nebula (labeled inner shell); and (2) a distorted H I ring, 28 pc in diameter, also detected in IR emission (outer shell). The borders of the inner shell strikingly follows the brightest regions of NGC 6888, showing the sites where the interaction between the nebula and the surrounding gas occurs. A third structure, the external feature, is a broken arc detected at slightly higher velocities than the former shells. We propose a scenario in which the strong stellar wind of HD 192163, expanding in an inhomogeneous interstellar medium, blew the outer shell during the main sequence phase of the star. Later, the material ejected by the star during the LBV (or RSG) and WR phases created NGC 6888. This material encountered the innermost wall of the outer shell originating the inner shell. The association of the external feature with the star and the nebula is not clear. © 1996 American Astronomical Society.

Registro:

Documento: Artículo
Título:The interaction of NGC 6888 and HD 192163 with the surrounding interstellar medium
Autor:Cappa, C.E.; Dubner, G.M.; Rogers, C.; St-Louis, N.
Filiación:Inst. Argentino de Radioastronomia, CC 5, 1894 Villa Elisa, Argentina
Fac. de Cie. Astronomicas y Geofis., Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
Inst. Astronomia y Fis. del Espacio, CC 67, 1428 Buenos Aires, Argentina
Dominion Radio Astrophysical Observ., National Research Council of Canada, P.O. Box 248, Penticton, BC V2A 6K3, Canada
Universitè de Montréal, Dépt. de Physique, C.P. 6128, Suc. Centre Ville, Montréal, Que. H3C 3J7, Canada
Observatoire du Mont Mégantic
CONICET, Argentina
Año:1996
Volumen:112
Número:3
Página de inicio:1104
Página de fin:1114
DOI: http://dx.doi.org/10.1086/118082
Título revista:Astronomical Journal
Título revista abreviado:Astron. J.
ISSN:00046256
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046256_v112_n3_p1104_Cappa

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Citas:

---------- APA ----------
Cappa, C.E., Dubner, G.M., Rogers, C. & St-Louis, N. (1996) . The interaction of NGC 6888 and HD 192163 with the surrounding interstellar medium. Astronomical Journal, 112(3), 1104-1114.
http://dx.doi.org/10.1086/118082
---------- CHICAGO ----------
Cappa, C.E., Dubner, G.M., Rogers, C., St-Louis, N. "The interaction of NGC 6888 and HD 192163 with the surrounding interstellar medium" . Astronomical Journal 112, no. 3 (1996) : 1104-1114.
http://dx.doi.org/10.1086/118082
---------- MLA ----------
Cappa, C.E., Dubner, G.M., Rogers, C., St-Louis, N. "The interaction of NGC 6888 and HD 192163 with the surrounding interstellar medium" . Astronomical Journal, vol. 112, no. 3, 1996, pp. 1104-1114.
http://dx.doi.org/10.1086/118082
---------- VANCOUVER ----------
Cappa, C.E., Dubner, G.M., Rogers, C., St-Louis, N. The interaction of NGC 6888 and HD 192163 with the surrounding interstellar medium. Astron. J. 1996;112(3):1104-1114.
http://dx.doi.org/10.1086/118082