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19 April 2024 |
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X-ray emission from hydrodynamical simulations in non-LTE wind models | | J. Krticka
; A. Feldmeier
; L. M. Oskinova
; J. Kubat
; W.-R. Hamann
; | | Date: |
19 Oct 2009 | | Abstract: | Hot stars are sources of X-ray emission originating in their winds. Although
hydrodynamical simulations that are able to predict this X-ray emission are
available, the inclusion of X-rays in stationary wind models is usually based
on simplifying approximations. To improve this, we use results from
time-dependent hydrodynamical simulations of the line-driven wind instability
(seeded by the base perturbation) to derive the analytical approximation of
X-ray emission in the stellar wind. We use this approximation in our non-LTE
wind models and find that an improved inclusion of X-rays leads to a better
agreement between model ionization fractions and those derived from servations.
Furthermore, the slope of the L_x-L relation is in better agreement with
observations, however the X-ray luminosity is underestimated by a factor of
three. We propose a possible solution for this discrepancy. | | Source: | arXiv, 0910.3430 | | Services: | Forum | Review | PDF | Favorites | |
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