On The Importance Of The Interclump Medium For Superionization: O VI Formation In The Wind Of ζ Pup.

Details On The Importance Of The Interclump Medium For Superionization: O VI Formation In The Wind Of ζ Pup. On The Importance Of The Interclump Medium For Superionization: O VI Formation In The Wind Of ζ Pup.

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340815z&link_type=abstract

American Astronomical Society, AAS Meeting #213, #408.15

Astronomy and Astrophysics

Astronomy

Scientific paper

We have studied superionization and X-ray line formation in the spectra of ζ 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 λλ1032, 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 ζ 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.
Acknowledgments: This research was supported by STScI grant HST-AR-10693.02 and by SAO grant TM6-7003X. M. A. L. acknowledges support from a fellowship administered by Oak Ridge Associated Universities under the NASA Postdoctoral Program. J.-C. B. acknowledges financial support from the French National Research Agency (ANR) through program number ANR-06-BLAN-0105.

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