The 'Hubble-type' outflows from the high excitation, poly-polar planetary nebula NGC 6302

Details The 'Hubble-type' outflows from the high excitation, poly-polar planetary nebula NGC 6302 The 'Hubble-type' outflows from the high excitation, poly-polar planetary nebula NGC 6302

2005-07-28

arxiv.org/abs/astro-ph/0507675v1

Astron.J.130:2303-2311,2005

Astronomy and Astrophysics

Astrophysics

32 pages, 15 figures, accepted by Astronomical Journal

Scientific paper

10.1086/496978

Spatially resolved profiles of the Halpha and [NII] lines have been obtained at unprecendented signal--to--noise ratios over the outflowing lobes of the high--excitation, poly--polar planetary nebula NGC~6302. A deep image in the light of [NII]6584 A was also obtained of the extremities of the prominent north--western lobe. The Manchester Echelle spectrometer combined with the 2.1--m San Pedro Martir telescope (Mexico) was used for these observations. Firstly, an accurate value of the systemic heliocentric radial velocity of Vsys = -29.8 +/- 1 km/s has been established. Also, from `velocity ellipses' across its diameter from previous observations the parallel--sided north--western lobe is shown to have a circular section with a tilt of its axis to the plane of the sky of 12.8 deg. With this starting point the pv arrays of profiles have been very closely simulated, using the SHAPE code, with Hubble-type outflows. The faint extremities of the north--western outflow are shown to be expanding at 600 km/s. The prominent lobes of NGC~6302 have then been generated in an eruptive event with a dynamical age of 1900 y for the expansion proper-motion distance of 1.04 +/- 0.16 kpc as measured here by comparing a 1956 image with that taken in 2002. Kinematical evidence of a high--speed `skirt' around the nebular core, expanding nearly orthogonally to the lobes, is also presented as are the unusual motions at the western extremities of the NW lobe.

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