Modeling CHANDRA low energy transmission grating spectrometer observations of classical novae with PHOENIX I. V4743 Sagittarii

A. Petz, P. H. Hauschildt, J. U. Ness, Sumner Starrfield

Research output: Contribution to journalArticle

26 Scopus citations


We use the PHOENIX code package to model the X-ray spectrum of Nova V4743 Sagittarii observed with the LETGS onboard the Chandra satellite 19 March 2003. Our atmosphere models are ID spherical, expanding, line blanketed, and in full non-local thermodynamic equilibrium. To analyze nova atmospheres and related systems with an underlying nuclear burning envelope at X-ray wavelengths, it was necessary to update the code with new microphysics, as discussed in this paper. We demonstrate that the X-ray emission is dominated by thermal bremsstrahlung and that the hard X-rays are dominated by Fe and N absorption. The best fit to the observation is provided at a temperature of Teff = 5.8 × 105 K, with Lbol = 50000 L⊙. The models are calculated for solar abundances. It is shown that the models can be used to determine abundances in the nova ejecta.

Original languageEnglish (US)
Pages (from-to)321-328
Number of pages8
JournalAstronomy and Astrophysics
Issue number1
StatePublished - Feb 1 2005



  • Atomic data
  • Stars: atmospheres
  • Stars: novae, cataclysmic variables
  • X-rays: individuals: V4743 Sgr

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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