Abundances in planetary nebulae: Hb 5

S. R. Pottasch*, R. Surendiranath

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)

Abstract

The ISO spectra of the bilobal planetary nebula Hb 5 are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition of the nebula is then calculated in several ways. First by directly calculating and adding individual ion abundances, assuming that all the ionic lines are formed in an ionized region surrounding the ionizing star. Secondly by building an "end-to-end model" nebula in which we have included a neutral region and a photodissociation region (PDR) beyond the ionized nebula. In this way we attempt to interpret the molecular hydrogen lines observed by ISO in a more self-consistent way. In the final analysis, the model is found to be basically heuristic, but gives new insights about the PDR and the PN. The implications of these are discussed.

Original languageEnglish
Pages (from-to)179-192
Number of pages14
JournalAstronomy & astrophysics
Volume462
Issue number1
DOIs
Publication statusPublished - Jan-2007

Keywords

  • ISM : abundances
  • planetary nebulae : individual : Hb 5
  • stars : evolution
  • HII regions
  • MAIN-SEQUENCE NEBULAE
  • STAR-FORMING REGIONS
  • MOLECULAR-HYDROGEN
  • GALACTIC BULGE
  • PHOTODISSOCIATION REGIONS
  • TRANSITION-PROBABILITIES
  • FORBIDDEN LINES
  • SPECTRA
  • EMISSION
  • EXCITATION

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