SIMBAD references

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.