Issue |
A&A
Volume 436, Number 1, June II 2005
|
|
---|---|---|
Page(s) | 155 - 163 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20042344 | |
Published online | 20 May 2005 |
H I bubbles surrounding southern optical ring nebulae: Anon (WR 23) and RCW 52
1
Instituto Argentino de Radioastronomía, CC 5, 1894 Villa Elisa, Argentina e-mail: ccappa@fcaglp.fcaglp.unlp.edu.ar
2
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
3
Australia Telescope National Facility, CSIRO; PO Box 76, Epping NSW 1710, Australia
Received:
9
November
2004
Accepted:
17
January
2005
We analyze the interstellar medium in the environs of two hot
and massive stars, HD 92809 (=WR 23, WC6) and LSS 1887 (O8V), which ionize
the optical ring nebulae Anon (WR 23) and RCW 52, respectively. Our analysis
is based on neutral hydrogen (Hi) 21 cm line data, which reveal
interstellar bubbles surrounding the massive stars and their optical ring
nebulae. The Hi bubble related to WR 23 is 13.3 pc in radius and is
expanding at 10 km s-1. The associated atomic neutral mass is
830 . The Hi structure related to LSS 1887 is about 6.3 pc
in radius, has an expansion velocity of 7 km s-1 and an associated
atomic neutral mass of 100
.
These Hi features are the neutral counterparts of the optical
ring nebulae and were mainly created by
the action of the stellar winds of the massive stars on their environs.
The dynamical age of the Hi bubble around WR 23 (
yr) suggests that it was created during the WR phase of stellar evolution.
However, the large tangential motions of WR 23 and LSS 1887 suggest that
part of the observed optical and Hi structures may be due to a bow
shock.
The analysis of the distribution of emission in the far infrared and
in the CO(1-0) molecular line in the environs of WR 23 and LSS 1887
reveals that there are also infrared and molecular counterparts of the
detected Hi bubbles.
Key words: ISM: bubbles / Hii regions
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.