2006A&A...456..591M -
Astronomy and Astrophysics, volume 456, 591-597 (2006/9-3)
IC5217 as a double-shell, point-symmetric planetary nebula with a very narrow waist.
MIRANDA L.F., AYALA S., VAZQUEZ R. and GUILLEN P.F.
Abstract (from CDS):
Identification of the structural components and analysis of the internal kinematics in the planetary nebula IC5217. Narrow-band images and high resolution long-slit spectra in the Hα, [NII] and [OIII] emission lines, and VLA 6cm continuum data. IC5217 is composed of a very bright equatorial ring, open bipolar lobes, off-axis point-symmetric features, on-axis distant faint regions, and an off-axis very elongated bipolar structure. The ring, open lobes, point-symmetric features and distant faint regions appear as elements of a single point-symmetric bipolar shell with a very narrow waist. This shell presents an axis ratio of ∼37 and an aspect ratio of ∼5. The 6cm data show that the ring is an extremely flat disk with a central hole. Expansion velocity in the ring ranges from ≤10km/s in HeII up to ≃27km/s in [NII], whereas a velocity of ∼460km/s is estimated for the polar regions of the bipolar shell. Strong acceleration of the outer regions of the ring is observed. The elongated bipolar structure probably represents a highly collimated (aspect ratio ∼12), high velocity cylindrical-like shell. A collimated agent (wind or jet) would account for the shaping of the bipolar shell if this agent has operated in the direction perpendicular to the equatorial disk. The point-symmetric features and cylindrical shell are probably related to collimated ejections but that occurred when the basic nebular shape had already been established.
Abstract Copyright:
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Journal keyword(s):
planetary nebulae: individual: IC5217 - ISM: jets and outflows
Simbad objects:
7
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