A kinematical investigation of the bipolar planetary nebula NGC 650-1

Details A kinematical investigation of the bipolar planetary nebula NGC 650-1 A kinematical investigation of the bipolar planetary nebula NGC 650-1

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...307..253b&link_type=abstract

Astronomy and Astrophysics, v.307, p.253

Astronomy and Astrophysics

Astrophysics

11

Circumstellar Matter, Interstellar Matter: Kinematics And Dynamics, Hydrodynamics, Planetary Nebulae: General, Planetary Nebulae: Individual: Ngc 650-1

Scientific paper

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.

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