2001A&A...369.1088R -
Astronomy and Astrophysics, volume 369, 1088-1103 (2001/4-3)
3-D ionization structure (in stereoscopic view) of planetary nebulae: the case of NGC 1501.
RAGAZZONI R., CAPPELLARO E., BENETTI S., TURATTO M. and SABBADIN F.
Abstract (from CDS):
Long-slit echellograms of the high excitation planetary nebula NGC 1501, reduced according to the methodology developed by Sabbadin et al. (
2000A&A...355..688S,
2000A&A...361.1112S), allowed us to obtain the ``true'' distribution of the ionized gas in the eight nebular slices covered by the spectroscopic slit. A 3-D rendering procedure is described and applied, which assembles the tomographic maps and rebuilds the spatial structure. The images of NGC 1501, as seen in 12 directions separated by 15°, form a series of stereoscopic pairs giving surprising 3-D views in as many directions. The main nebula consists of an almost oblate ellipsoid of moderate ellipticity (a≃44arcsec, a/b≃1.02, a/c≃1.11), brighter in the equatorial belt, deformed by several bumps, and embedded in a quite homogeneous, inwards extended cocoon. Some reliability tests are applied to the rebuilt nebula; the radial matter profile, the small scale density fluctuations and the 2-D (morphology) - 3-D (structure) correlation are presented and analysed. The wide applications of the 3-D reconstruction to the morphology, physical conditions, ionization parameters and evolutionary status of expanding nebulae in general (planetary nebulae, nova and supernova remnants, shells around Population I Wolf-Rayet stars, nebulae ejected by symbiotic stars, bubbles surrounding early spectral type main sequence stars etc.) are introduced.
Abstract Copyright:
∼
Journal keyword(s):
planetary nebulae: individual: NGC 1501 - ISM: kinematics and dynamics
CDS comments:
p.1098: A53, A73, A70 not identified
Simbad objects:
20
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