Issue |
A&A
Volume 369, Number 3, April III 2001
|
|
---|---|---|
Page(s) | 1088 - 1103 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20010229 | |
Published online | 15 April 2001 |
3-D ionization structure (in stereoscopic view) of planetary nebulae: the case of NGC 1501
Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy
Corresponding author: F. Sabbadin, sabbadin@pd.astro.it
Received:
9
January
2001
Accepted:
29
January
2001
Long-slit echellograms of the high excitation planetary nebula NGC
1501, reduced according to the methodology developed by Sabbadin et al. (2000a,b), 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
15o,
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 ( arcsec,
,
),
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.
Key words: planetary nebulae: individual: NGC 1501 / ISM: kinematics and dynamics
© ESO, 2001
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