An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155

The neutral hydrogen distribution has been studied in the direction of three Galactic Wolf-Rayet (WR) stars using the 100 m Effelsberg radio telescope. Cavities in the HI distribution, regions of low HI emissivity, are observed over a 8-9 km s-1 velocity range for WR 126 (≡ST 2), WR 154 (≡HD 213049)...

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Detalles Bibliográficos
Autores principales: Cichowolski, Silvina, Arnal, Edmundo Marcelo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Ciencias Astronómicas
ISM: bubbles
Stars: individual: WR 126, WR 154, WR 155
Stars: Worlf-Rayet
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84793
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84793
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
ISM: bubbles
Stars: individual: WR 126, WR 154, WR 155
Stars: Worlf-Rayet
spellingShingle Ciencias Astronómicas
ISM: bubbles
Stars: individual: WR 126, WR 154, WR 155
Stars: Worlf-Rayet
Cichowolski, Silvina
Arnal, Edmundo Marcelo
An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155
topic_facet Ciencias Astronómicas
ISM: bubbles
Stars: individual: WR 126, WR 154, WR 155
Stars: Worlf-Rayet
description The neutral hydrogen distribution has been studied in the direction of three Galactic Wolf-Rayet (WR) stars using the 100 m Effelsberg radio telescope. Cavities in the HI distribution, regions of low HI emissivity, are observed over a 8-9 km s-1 velocity range for WR 126 (≡ST 2), WR 154 (≡HD 213049) and WR 155 (≡HD 214419). These minima are interpreted as the observable 21-cm HI line counterpart of interstellar bubbles created by the winds of the WR stars and their progenitors. The HI cavities are elongated structures depicting an axial ratio ranging from 1.3 (WR 155) to 3 (WR 126). The WR stars are always eccentric with respect to either the geometric centre of the HI cavity or the absolute minimum inside it. This offset ranges from 50% to 80% of the HI hole's minor axis. The major axis of these structures range from 13 (WR 155) to 27 pc (WR 126), while the missing HI mass amounts to 45-50 M⊙ (WR 126), 60 M⊙ (WR 155) and 85 M⊙ (WR 154).
format Articulo
Articulo
author Cichowolski, Silvina
Arnal, Edmundo Marcelo
author_facet Cichowolski, Silvina
Arnal, Edmundo Marcelo
author_sort Cichowolski, Silvina
title An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155
title_short An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155
title_full An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155
title_fullStr An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155
title_full_unstemmed An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155
title_sort effelsberg hi study of the ism around wr 126, wr 154 and wr 155
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/84793
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