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Density of Low-ionization Structures in PNe

Published online by Cambridge University Press:  26 May 2016

Denise R. Gonçalves ,
Romano L.M. Corradi ,
Antonio Mampaso  and
Cristina Campos
Denise R. Gonçalves
Affiliation:
Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
Romano L.M. Corradi
Affiliation:
Isaac Newton Group - La Palma, Spain
Antonio Mampaso
Affiliation:
Instituto de Astrofísica de Canarias
Cristina Campos
Affiliation:
Departamento de Astrofísica, Universidad de La Laguna - Tenerife, Spain

Abstract

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We have recently completed a comprehensive analysis of the morphological and kinematical properties of ~ 50 PNe which are known to possess low-ionization (micro)structures (LISs; Gonçalves et al. 2001). This study has shown that density is a crucial parameter for distinguishing among several physical processes responsible for their formation and evolution.

We are at present analysing long-slit, medium-resolution optical spectra of 18 PNe in order to determine the physical parameters of the LISs and their environments. These data were obtained with the 1.5 m Danish (ESO) and the 2.5 m Isaac Newton (ORM) telescopes.

Here we show the first results of this survey, presenting the density variation of NGC 7009 and comparing it with the derived densities of K 4-47 and Wray 17-1.

Type
Part VII: Nebular Morphology and Dynamics
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 517 - 518
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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