INVESTIGADORES
CICHOWOLSKI Silvina
artículos
Título:
An Effelsberg HI study of the ISM around WR 126, WR 154 and WR 155
Autor/es:
CICHOWOLSKI SILVINA; ARNAL E. MARCELO
Revista:
ASTRONOMY AND ASTROPHYSICS
Referencias:
Año: 2004 vol. 414 p. 203 - 209
ISSN:
0004-6361
Resumen:
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 Mȯ (WR 126), 60
Mȯ (WR 155) and 85 Mȯ (WR 154).
Figures 1, 3, 5 are only available in electronic form at
http://www.edpsciences.org