SIMBAD references

High resolution, spatially resolved measurements of the Hα and [NII] 6584 A emission lines of the core of the PN Fleming 1 (taken with the Manchester Echelle Spectrometer on the Anglo-Australian telescope) reveal it to be a butterfly type nebula with an unusual toroidal structure around its waist expanding radially outwards at a velocity of 36km/s. The strings of knots of gas to the north and south of the core are confirmed to be generated by globules of gas ejected at a velocity of about 85km/s from the core by an episodic, bipolar, rotating source. The lifetime of the globules is considered and the line emission from the knots is shown to be most likely dominated by bow shocked ambient gas. A jet-like feature visible close to the edge of the nebular core is shown to have a different nature to that of the knots.