Dynamical simulation of the ``velocity-porosity'' reduction in observed strength of stellar wind lines

Details Dynamical simulation of the ``velocity-porosity'' reduction in observed strength of stellar wind lines Dynamical simulation of the ``velocity-porosity'' reduction in observed strength of stellar wind lines

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cihw.conf..121o&link_type=abstract

Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007. Hamann, Wol

Computer Science

10

Scientific paper

I use dynamical simulations of the line-driven instability to examine the potential role of the resulting flow structure in reducing the observed strength of wind absorption lines. Instead of the porosity length formalism used to model effects on continuum absorption, I suggest reductions in line strength can be better characterized in terms of a velocity clumping factor that is insensitive to spatial scales. Examples of dynamic spectra computed directly from instability simulations do exhibit a net reduction in absorption, but only at a modest 10-20% level that is well short of the ca. factor 10 required by recent analyses of PV lines.

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