A stellar wind blown bubble associated with the wolf-rayet star HD 197406

A field of 2° sq. centered on the position HD 197406 (a spectroscopic binary composed of a WN7 star + unseen companion), has been surveyed in the H I 21 cm line and in the 1420 and 408 MHz radio continuum, using the synthesis radio telescope of the Dominion Radio Astrophysical Observatory (Canada)....

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Publicado: 1990
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046256_v99_n3_p857_Dubner
http://hdl.handle.net/20.500.12110/paper_00046256_v99_n3_p857_Dubner
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00046256_v99_n3_p857_Dubner
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spelling paper:paper_00046256_v99_n3_p857_Dubner2023-06-08T14:27:16Z A stellar wind blown bubble associated with the wolf-rayet star HD 197406 A field of 2° sq. centered on the position HD 197406 (a spectroscopic binary composed of a WN7 star + unseen companion), has been surveyed in the H I 21 cm line and in the 1420 and 408 MHz radio continuum, using the synthesis radio telescope of the Dominion Radio Astrophysical Observatory (Canada). The spectral maps show the existence of a nearly complete ring-shaped H I shell (Rs ≅s 18 pc, νexp ≅ 6 km s-1, script M signet;H I ≅ 1200script M sign⊙) and, immersed within this shell, a small spherical bubble concentric with the star (Rb ≅4 pc, νexp ≅6 km s-1, script M signH I (missing) ≅ 8script M sign⊙). From these observations, a kinematical distance of 4.5 kpc is derived for HD 197406. At this distance, the binary has Mv≅ - 5.4 mag. The large H I shell is also detected at infrared wavelengths, as shown by the 60 and 100 μm IRAS images. We found neither thermal nor nonthermal radio sources associated with the binary system. Our observations suggest that the large shell has been created during previous evolutionary stages of the binary, while the small bubble has been recently blown by the WR wind. 1990 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046256_v99_n3_p857_Dubner http://hdl.handle.net/20.500.12110/paper_00046256_v99_n3_p857_Dubner
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description A field of 2° sq. centered on the position HD 197406 (a spectroscopic binary composed of a WN7 star + unseen companion), has been surveyed in the H I 21 cm line and in the 1420 and 408 MHz radio continuum, using the synthesis radio telescope of the Dominion Radio Astrophysical Observatory (Canada). The spectral maps show the existence of a nearly complete ring-shaped H I shell (Rs ≅s 18 pc, νexp ≅ 6 km s-1, script M signet;H I ≅ 1200script M sign⊙) and, immersed within this shell, a small spherical bubble concentric with the star (Rb ≅4 pc, νexp ≅6 km s-1, script M signH I (missing) ≅ 8script M sign⊙). From these observations, a kinematical distance of 4.5 kpc is derived for HD 197406. At this distance, the binary has Mv≅ - 5.4 mag. The large H I shell is also detected at infrared wavelengths, as shown by the 60 and 100 μm IRAS images. We found neither thermal nor nonthermal radio sources associated with the binary system. Our observations suggest that the large shell has been created during previous evolutionary stages of the binary, while the small bubble has been recently blown by the WR wind.
title A stellar wind blown bubble associated with the wolf-rayet star HD 197406
spellingShingle A stellar wind blown bubble associated with the wolf-rayet star HD 197406
title_short A stellar wind blown bubble associated with the wolf-rayet star HD 197406
title_full A stellar wind blown bubble associated with the wolf-rayet star HD 197406
title_fullStr A stellar wind blown bubble associated with the wolf-rayet star HD 197406
title_full_unstemmed A stellar wind blown bubble associated with the wolf-rayet star HD 197406
title_sort stellar wind blown bubble associated with the wolf-rayet star hd 197406
publishDate 1990
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046256_v99_n3_p857_Dubner
http://hdl.handle.net/20.500.12110/paper_00046256_v99_n3_p857_Dubner
_version_ 1768542153514942464

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