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Astron. Astrophys. 335, 1029-1039 (1998)

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A bipolar outflow in the M 1-67 nebula around the Wolf-Rayet star WR 124 *

Marco Sirianni 1, 2, Antonella Nota ** 1, Anna Pasquali 1 and Mark Clampin 1

1 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
2 Center of Studies and Activities for Space "G. Colombo", University of Padova, Italy

Received 1 September 1997 / Accepted 13 November 1997

Abstract

Ground based high resolution coronographic images of the inner M 1-67 nebula ([FORMULA] 40" [FORMULA] 60") around the Wolf Rayet WR 124 have been obtained with the Johns Hopkins Adaptive Optic Coronograph at the Swope 40" telescope, Las Campanas, in the light of H[FORMULA] + [NII]. The inner M 1-67 nebula appears very clumpy and remarkably axisymmetric. In addition, we present new high signal-to-noise long slit spectroscopic data, with full spatial coverage of the nebula ([FORMULA] 90" [FORMULA] 75"), which have been used the save derive its radial velocity map (from the [NII] 6583 Å line profile). The radial velocity data reveal the presence of two different motions in the enviroment of WR 124: a spherical hollow shell, 46" in radius, expanding with a velocity of 46 km s-1, and a newly discovered bipolar outflow, with a velocity of 88 km s-1. Their dynamical ages are estimated to be 2 [FORMULA] 104 yrs and 1.2 [FORMULA] 104 yrs respectively, and their overall N enriched composition seem to indicate that they formed during the post-main sequence evolution of WR 124. This scenario is consistent with two subsequent outbursts, possibly occurred during a previous LBV phase.

Key words: stars: individual: WR 124 – ISM: individual objects: M 1 – 67 – stars: mass-loss – stars: Wolf-Rayet – ISM: bubbles – ISM: jets and outflows

* Based on observations obtained at the European Southern Observatory, La Silla
** Affiliated with the Astrophysics Division, Space Science Department of the European Space Agency

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© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998
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