M 1-67 : A wind-blown bubble carried along by the high-velocity WR star 209 BAC ?

Long-slit coude spectrograms in red light and of high spectral and spatial resolution are presented for the peculiar nebula M1-67 (S80). The velocity field of the nebula is explained in terms of a nearly spherical thin shell having a diameter of 90 arcsec and expanding at a velocity of 42 km/s. A heliocentric radial velocity of 158 km/s is derived for the center of expansion, while velocities of 175-200 km/s are determined for a broad H-alpha line feature observed in the high-velocity central WR star, 209 BAC. The observations are shown to be consistent with either nearly isotropic mass ejection from the central star about 20,000 yr ago or the action of a strong stellar wind producing an expanding bubble of swept-up ambient material that had been lost by the central star before the bubble was formed.