Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-27
Astronomy and Astrophysics
Astrophysics
12 pages, 5 figures, MNRAS in press
Scientific paper
10.1111/j.1365-2966.2007.12782.x
The ouflowing proper motions of fifteen knots in the dominant northwestern lobe of the high-excitation poly-polar planetary nebula NGC 6302 have been determined by comparing their positions relative to those of faint stars in an image taken at the San Pedro Martir Observatory in 2007 to those in a South African Astronomical Observatory archival plate obtained by Evans in 1956. The Hubble-type expansion of this lobe is now directly confirmed in a model independent way from these measurements. Furthermore, an unambiguous distance to NGC 6302 of 1.17 +/- 0.14 kpc is now determined. Also all the velocity vectors of the fifteen knots (and two others) point back to the central source. An eruptive event from within the central torus, approximately 2200 years previously must have created the high speed lobes of NGC 6302.
Lloyd Matthew
Lopez Jose Alberto
Meaburn John
Vaytet N. M. H.
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