Issue |
A&A
Volume 395, Number 3, December I 2002
|
|
---|---|---|
Page(s) | 955 - 967 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20021304 | |
Published online | 18 November 2002 |
An
interstellar bubble linked to the O-type stars
BD +24°3866 and BD +25°3952
1
Instituto Argentino de Radioastronomía, C.C. 5, 1894 Villa Elisa, Argentina
2
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
3
Département de Physique et Observatoire du Mont Mégantic, Université Laval, Québec, Canada G1K 784
Corresponding author: C. Cappa, ccappa@fcaglp.fcaglp.unlp.edu.ar
Received:
12
April
2002
Accepted:
5
September
2002
We investigate the ISM in the vicinity of the O-type stars
BD +24°3866 (O8.5II(f)), BD +24°3881 (O6.5III(f)) and BD +24°
3952 (O8) based on radio continuum
and Hi line data obtained with the Synthesis Telescope of the Dominion
Radio Astrophysical Observatory (DRAO) with synthesized beams of
1 5 and 7´ at 1420 and 408 MHz, respectively. High
angular resolution IRAS data (HIRES) are also analyzed.
BD +24°3866 is found to be located close to the inner border of
a slowly expanding shell. The evolved Hii region Sh2-88, which is
excited by BD +25°3952, appears to be interacting with neutral
material in the approaching part of this shell. The whole structure
is at a distance of 2.4 kpc and is about 23
15 pc in radius. The total swept up mass is 1300
.
The stellar winds of BD +24°3866 and BD +25°3952, are mainly
responsible for shaping the Hi structure.
An Hi expanding shell was also found to be related to the Hii region
G61.7+0.9. At a kinematic distance of 2.4 kpc, this feature is 10 pc in
radius and has neutral and ionized masses of 200 and 135
, respectively.
The present observational data do not allow us to identify a definite
interstellar Hi feature associated with BD +24°3881. We consider
different explanations for this fact.
Key words: ISM: bubbles / Hii regions / ISM: individual objects: Sh2-88, Sh2-87, G61.7+0.9 / stars: early-type / stars: individual: BD +24°3866, BD +24°3881, BD +25°3952
© ESO, 2002
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.