Classification of planetary nebulae Virtual Observatory Resource

Authors
  1. Quireza C.
  2. Rocha-Pinto H.J.
  3. Maciel W.J.
  4. Published by
    CDS
Abstract

In this paper we present a re-analysis of the criteria used to characterize the Peimbert classes I, IIa, IIb, III and IV, through a statistical study of a large sample of planetary nebulae previously classified according to these groups. In the original classification, it is usual to find planetary nebulae that cannot be associated with a single type; these most likely have dubious classifications into two or three types. Statistical methods can greatly contribute in providing a better characterization of planetary nebulae groups. We use the Bayes Theorem to calculate the posterior probabilities for an object to be member of each of the types I, IIa, IIb, III and IV. This calculation is particularly important for planetary nebulae that are ambiguously classified in the traditional method. The posterior probabilities are defined from the probability density function of classificatory parameters of a well-defined sample, composed only by planetary nebulae unambiguously fitted into the Peimbert types. Because the probabilities depend on the available observational data, they are conditional probabilities, and, as new observational data are added to the sample, the classification of the nebula can be improved, to take into account this new information. This method differs from the original classificatory scheme, because it provides a quantitative result of the representativity of the object within its group. Also, through the use of marginal distributions it is possible to extend the Peimbert classification even to those objects for which only a few classificatory parameters are known.

Keywords
  1. planetary-nebulae
  2. chemical-abundances
Bibliographic source Bibcode
2007A&A...475..217Q
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/475/217
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/475/217
Document Object Identifer DOI
doi:10.26093/cds/vizier.34750217

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/475/217
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/475/217
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/475/217
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/475/217/pne?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/475/217/pne?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/475/217/pne?

History

2008-01-23T20:52:42Z
Resource record created
2008-01-23T20:52:42Z
Created
2017-06-20T13:16:27Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr