Issue |
A&A
Volume 414, Number 1, January IV 2004
|
|
---|---|---|
Page(s) | 203 - 209 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20031620 | |
Published online | 12 January 2004 |
An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155*
1
Instituto Argentino de Radioastronomía, CC # 5, 1894 Villa Elisa, Argentina e-mail: silvina@iar.unlp.edu.ar (Fellowship from CONICET, Argentina.)
2
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional La Plata, 1900 La Plata, Argentina e-mail: arnal@iar.unlp.edu.ar (Member of Carrera del Investigador Científico, CONICET, Argentina.)
Received:
5
May
2003
Accepted:
22
August
2003
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 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
(WR 126), 60
(WR 155) and 85
(WR 154).
Key words: ISM: bubbles / stars: Wolf-Rayet / stars: individual: WR 126, WR 154, WR 155
© ESO, 2004
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