Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-06
Astronomy and Astrophysics
Astrophysics
Appearing in "Clumping in Hot Star Winds," eds. Hamann, Feldmeier, & Oskinova, Potsdam: Univ.-Verl., 2007; 3 pages; 5 color fi
Scientific paper
By quantitatively fitting simple emission line profile models that include both atomic opacity and porosity to the Chandra X-ray spectrum of $\zeta$ Pup, we are able to explore the trade-offs between reduced mass-loss rates and wind porosity. We find that reducing the mass-loss rate of $\zeta$ Pup by roughly a factor of four, to 1.5 \times 10^{-6} M_sun/yr, enables simple non-porous wind models to provide good fits to the data. If, on the other hand, we take the literature mass-loss rate of 6 \times 10^{-6} M_sun/yr, then to produce X-ray line profiles that fit the data, extreme porosity lengths -- of $h_{\infty} \approx 3$ Rstar -- are required. Moreover, these porous models do not provide better fits to the data than the non-porous, low optical depth models. Additionally, such huge porosity lengths do not seem realistic in light of 2-D numerical simulations of the wind instability.
Cohen David H.
Leutenegger Maurice A.
Townsend Richard H. D.
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