Far ultraviolet spectroscopic explorer observations of nebular O VI emission from NGC 6543

Robert A. Gruendl, You Hua Chu, Martín A. Guerrero

Research output: Contribution to journalArticlepeer-review

Abstract

NGC 6543 is one of the few planetary nebulae whose X-ray emission has been shown to be extended and to originate from hot interior gas. Using Far Ultraviolet Spectroscopic Explorer observations, we have now detected nebular O VI emission from NGC 6543. Its central star, with an effective temperature of ∼50,000 K, is too cool to photoionize O V, so the O VI ions must have been produced by thermal collisions at the interface between the hot interior gas and the cool nebular shell. We modeled the O VI emission incorporating thermal conduction but find that simplistic assumptions for the asymptotic giant branch and fast wind mass-loss rates overproduce X-ray emission and O VI emission. We have therefore adopted the pressure of the interior hot gas for the interface layer and find that expected O VI emission to be comparable to the observations.

Original languageEnglish (US)
Pages (from-to)L127-L130
JournalAstrophysical Journal
Volume617
Issue number2 II
DOIs
StatePublished - Dec 20 2004

Keywords

  • Conduction
  • Planetary nebulae: individual (NGC 6543)
  • Ultraviolet: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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