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BIB-VERSION:: AST-PP-v1.0
ID:: epreps.stsci//prep1211
ENTRY:: March 9, 1998
TITLE:: A Bipolar Outflow in the M1-67 Nebula around the Wolf-Rayet Star WR124
SUBTITLE::
AUTHOR:: Sirianni, Marco (1) (2)
AUTHOR:: Nota, Antonella (1) (3)
AUTHOR:: Pasquali, Anna (1)
AUTHOR:: Clampin, Mark (1)
AFFIL:: (1) Space Telescope Science Institute 3700 San Martin Drive Baltimore, MD 21218 USA
AFFIL:: (2) Center of Studies and Activities for Space "G. Colombo" University of Padova, Italy
AFFIL:: (3) Affiliated with the Astrophysics Division, Space Science Department of the European Space Agency
DATE:: January 1998
JOURNAL:: To appear in:
SUBMITTED::
ACCEPTED::
OTHER_ACCESS::
COPYRIGHT:: Copyright 1998 The Association of Universities for Research in Astronomy, Inc. All Rights Reserved.
LANGUAGE:: English
ABSTRACT::

Ground based high resolution coronographic images of the inner M1-67
nebula
( 40" × 60") 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 H + [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" × 75"), which have been used to 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 environment of
WR124: 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 × 10⁴ yrs
and 1.2 × 10⁴ yrs
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 occured during a previous LBV phase.

END:: epreps.stsci//prep1211