Possible wind blown bubbles associated with five Of stars

Citation
P. Benaglia et Ce. Cappa, Possible wind blown bubbles associated with five Of stars, ASTRON ASTR, 346(3), 1999, pp. 979-989
Citations number
74
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
346
Issue
3
Year of publication
1999
Pages
979 - 989
Database
ISI
SICI code
0004-6361(199906)346:3<979:PWBBAW>2.0.ZU;2-L
Abstract
Four fields of similar to 5 degrees x 4 degrees have been surveyed using th e HI-21 cm line (HPBW = 0.degrees 5) in searching for HI interstellar bubbl es in the environs of several Of stars. The analysis of the data disclosed four bubble candidates, three with almost complete envelopes. Their dimensi ons are similar to 40 pc and their expansion velocities around 10 km s(-1). For each structure swept-up masses (1000 to 8800 M.), original ambient gas densities (less than or similar to 0.6 cm(-3)), dynamical ages (similar to 2 Myr) and kinetic energies (less than or similar to 2 x 10(49) erg) were derived. The origin of the HI shells is discussed, taking into account thei r kinematics, energy, age and the emission at other wavelengths. As in the case of several WR HI shells, the O strong stellar winds would be the main agents blowing the HI bubbles.