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| Paper: |
Imaging and Spectroscopy of the Planetary Nebula NGC 6778 |
| Volume: |
313, Asymmetrical Planetary Nebulae III |
| Page: |
127 |
| Authors: |
Maestro, V.; Guerrero, M.A.; Miranda, L.F. |
| Abstract: |
We present narrow-band images and long-slit echelle spectra of the planetary nebula (PN) NGC 6778. The data show this PN as bipolar, with a very prominent low-excitation equatorial toroid, high-excitation lobes and two pairs of collimated outflows. Morphologically, the pairs of outflows are different from each other; one is linear and oriented along the bipolar axis, the other presents an S-shape with changing orientations. Besides the different morphology, both pairs of collimated outflows present radial velocities increasing with distance from the central star and share a common origin in bright knots at the tips of the shell. |
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