Volume 395, Number 3, December I 2002
|Page(s)||955 - 967|
|Published online||18 November 2002|
An interstellar bubble linked to the O-type stars BD +24°3866 and BD +25°3952
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, firstname.lastname@example.org
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 2315 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
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