1998A&A...335.1029S

Ground based high resolution coronographic images of the inner M1-67 nebula (≃40''x60'') around the Wolf Rayet WR124 have been obtained with the Johns Hopkins Adaptive Optic Coronograph at the Swope 40'' telescope, Las Campanas, in the light of Hα+[NII]. The inner M1-67 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 (≃90''x 75''), which have been used the save derive its radial velocity map (from the [NII] 6583Å line profile). The radial velocity data reveal the presence of two different motions in the enviroment of WR124: a spherical hollow shell, 46'' in radius, expanding with a velocity of 46km/s, and a newly discovered bipolar outflow, with a velocity of 88km/s. Their dynamical ages are estimated to be 2x10⁴yrs and 1.2x10⁴yrs respectively, and their overall N enriched composition seem to indicate that they formed during the post-main sequence evolution of WR124. This scenario is consistent with two subsequent outbursts, possibly occurred during a previous LBV phase.