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On the Importance of the Interclump Medium for Superionization: O VI Formation in the Wind of Zeta Pup
- Publication Year :
- 2008
- Publisher :
- arXiv, 2008.
-
Abstract
- We have studied superionization and X-ray line formation in the spectra of Zeta Pup using our new stellar atmosphere code (XCMFGEN) that can be used to simultaneously analyze optical, UV, and X-ray observations. Here, we present results on the formation of the O VI ll1032, 1038 doublet. Our simulations, supported by simple theoretical calculations, show that clumped wind models that assume void in the interclump space cannot reproduce the observed O VI profiles. However, enough O VI can be produced if the voids are filled by a low density gas. The recombination of O VI is very efficient in the dense material but in the tenuous interclump region an observable amount of O VI can be maintained. We also find that different UV resonance lines are sensitive to different density regimes in Zeta Pup : C IV is almost exclusively formed within the densest regions, while the majority of O VI resides between clumps. N V is an intermediate case, with contributions from both the tenuous gas and clumps.<br />Comment: Accepted for publication in ApJL, 4 pages with 3 figures
- Subjects :
- Physics
Void (astronomy)
010504 meteorology & atmospheric sciences
Astrophysics (astro-ph)
Stellar atmosphere
FOS: Physical sciences
Astronomy and Astrophysics
Observable
Astrophysics
01 natural sciences
Molecular physics
Spectral line
Space and Planetary Science
0103 physical sciences
Low density
Dense material
010303 astronomy & astrophysics
Recombination
0105 earth and related environmental sciences
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....ac0b2af6fcdacd76257b95ca47d2052a
- Full Text :
- https://doi.org/10.48550/arxiv.0808.2233