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Astron. Astrophys. 346, 979-989 (1999)


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Possible wind blown bubbles associated with five Of stars

P. Benaglia 1,2 and C.E. Cappa 1,3

1 Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Bs. As., Argentina
2 Instituto Astronômico e Geofísico, Universidade de São Paulo, Av. M. Stefano 4200, CEP 04301-904 São Paulo, SP, Brazil
3 Fac. de Cs. Astronómicas y Geofísicas, UNLP, Paseo del Bosque s/n, (1900) La Plata, Argentina

Received 1 September 1998 / Accepted 1 April 1999

Abstract

Four fields of [FORMULA] have been surveyed using the HI -21 cm line (HPBW = [FORMULA]) in searching for HI interstellar bubbles in the environs of several Of stars. The analysis of the data disclosed four bubble candidates, three with almost complete envelopes. Their dimensions are [FORMULA] 40 pc and their expansion velocities around 10 km s-1. For each structure swept-up masses (1000 to 8800 [FORMULA]), original ambient gas densities ([FORMULA] cm-3), dynamical ages ([FORMULA] 2 Myr) and kinetic energies ([FORMULA] erg) were derived. The origin of the HI shells is discussed, taking into account their 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.

Key words: stars: individual: HD 152386; HD 153919; HD 91572; HD 91824; HD 94963 – ISM: bubbles

Send offprint requests to: P. Benaglia, first address

© European Southern Observatory (ESO) 1999

Online publication: June 17, 1999

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