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Abstract:

We have investigated the neutral hydrogen in the direction of the Circinus OBI association with particular emphasis in the study of the vicinity of the WR stars WR 65 and WR 67. The HI line data were obtained with the Australia Telescope Compact Array with a synthesized beam of 4′.0 × 2′. 7 and a velocity resolution of 1.1 km s -1 . These data led to the discovery of a large cavity surrounded by an almost complete shell in agreement with the locations and distances of the two WR stars. We propose that the HI features constitute an interstellar bubble created by the powerful winds of the WR stars and their progenitors. By assuming a distance of 3 kpc, we calculate for this HI bubble a linear radius of 22 pc, a swept-up mass of 1600 M ⊙ and an expansion velocity of more than 7 km s -1 . High angular resolution IRAS infrared data (HIRES) reveal the presence of a ring with good spatial correlation with the HI shell. Eight IRAS protostellar candidates located around the HI cavity suggest that star formation may be taking place in the shell. Further investigation is required to confirm this proposition.

Registro:

Documento: Artículo
Título:The neutral gas in the environs of the Wolf Rayet stars in the Circinus OB1 association
Autor:Giacani, E.; Dubner, G.
Filiación:Inst. de Astron./Fis. del Espacio, CC 67, Suc. 28, 1428 Buenos Aires, Argentina
Palabras clave:ISM: general; Stars: individual: WR 65; Stars: individual: WR 67; Stars: Wolf-Rayet; Computational geometry; Data reduction; Hydrogen; Kinematics; Light emission; Nyquist diagrams; Optical resolving power; Optical telescopes; Neutral gases; Stars; Astrophysics
Año:2004
Volumen:413
Número:1
Página de inicio:225
Página de fin:231
DOI: http://dx.doi.org/10.1051/0004-6361:20034088
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v413_n1_p225_Giacani

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Citas:

---------- APA ----------
Giacani, E. & Dubner, G. (2004) . The neutral gas in the environs of the Wolf Rayet stars in the Circinus OB1 association. Astronomy and Astrophysics, 413(1), 225-231.
http://dx.doi.org/10.1051/0004-6361:20034088
---------- CHICAGO ----------
Giacani, E., Dubner, G. "The neutral gas in the environs of the Wolf Rayet stars in the Circinus OB1 association" . Astronomy and Astrophysics 413, no. 1 (2004) : 225-231.
http://dx.doi.org/10.1051/0004-6361:20034088
---------- MLA ----------
Giacani, E., Dubner, G. "The neutral gas in the environs of the Wolf Rayet stars in the Circinus OB1 association" . Astronomy and Astrophysics, vol. 413, no. 1, 2004, pp. 225-231.
http://dx.doi.org/10.1051/0004-6361:20034088
---------- VANCOUVER ----------
Giacani, E., Dubner, G. The neutral gas in the environs of the Wolf Rayet stars in the Circinus OB1 association. Astron. Astrophys. 2004;413(1):225-231.
http://dx.doi.org/10.1051/0004-6361:20034088