Radio emission from planetary nebulae Virtual Observatory Resource

Authors
  1. Siodmiak N.
  2. Tylenda R.
  3. Published by
    CDS
Abstract

We have analysed the radio fluxes for 264 planetary nebulae for which reliable measurements of fluxes at 1.4 and 5 GHz, and of nebular diameters are available. For many of the investigated nebulae, the optical thickness is important, especially at 1.4 GHz. Simple models like the one specified only by a single optical thickness or spherical, constant density shells do not account satisfactorily for the observations. Also an r^-2^ density distribution is ruled out. A reasonable representation of the observations can be obtained by a two-component model having regions of two different values of optical thickness. We show that the nebular diameters smaller than 10" are uncertain, particularly if they come from photographic plates or Gaussian fitting to the radio profile. While determining the interstellar extinction from an optical to radio flux ratio, caution should be paid regarding optical thickness effects in the radio. We have developed a method for estimating the value of self absorption. At 1.4 GHz self absorption of the flux is usually important and can exceed a factor of 10. At 5 GHz self absorption is negligible for most of the objects, although in some cases it can reach a factor of 2. The Galactic bulge planetary nebulae when used to calibrate the Shklovsky method give a mean nebular mass of 0.14M_{sun}_. The statistical uncertainty of the Shklovsky distances is smaller than a factor of 1.5.

Keywords
  1. planetary-nebulae
  2. radio-astronomy
  3. stellar-radii
Bibliographic source Bibcode
2001A&A...373.1032S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/373/1032
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/373/1032
Document Object Identifer DOI
doi:10.26093/cds/vizier.33731032

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/373/1032
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/373/1032
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/373/1032
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/373/1032/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/373/1032/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/373/1032/table1?

History

2001-09-07T20:53:20Z
Resource record created
2001-09-07T20:53:20Z
Created
2018-01-10T11:47:36Z
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