A kinematical investigation of the bipolar planetary nebula NGC 650-1
Abstract
High spatial and spectral resolution observations of the Hα, [N II]6584A and [O III]5007A emission line profiles from the planetary nebula NGC 650-1 have been obtained with the Isaac Newton and William Herschel Telescopes using the Manchester echelle spectrometer. These observations, and additional narrow-band images obtained using the San Pedro Martir telescope, are compared with synthesised images and spectra based on the generalised interacting stellar winds (GISW) models (involving a slow wind strongly concentrated towards the equatorial plane) and a good correspondence is found, confirming NGC 650-1 to be a bipolar wind-driven bubble orientated at an inclination of ~75deg with the NW lobe pointing towards the observer. There is a bright central ring with two attached (inner) lobes, which show typical expansion velocities of ~43km/s and ~60km/s respectively. Outside the inner lobes are the fainter outer lobes which are observed to have a very low expansion velocity (~5km/s), and which have on one side (SE) a polar cap which shows higher velocities again (~20km/s). The nature of these outer lobes remains unclear. The origin of discrepancies between the observations and models are discussed in some detail.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 1996
- Bibcode:
- 1996A&A...307..253B
- Keywords:
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- CIRCUMSTELLAR MATTER;
- INTERSTELLAR MATTER: KINEMATICS AND DYNAMICS;
- HYDRODYNAMICS;
- PLANETARY NEBULAE: GENERAL;
- PLANETARY NEBULAE: INDIVIDUAL: NGC 650-1