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2009MNRAS.394.1758P - Mon. Not. R. Astron. Soc., 394, 1758-1774 (2009/April-3)
3D modelling of the colliding winds in η Carinae - evidence for radiative inhibition.
PARKIN E.R., PITTARD J.M., CORCORAN M.F., HAMAGUCHI K. and STEVENS I.R.
Abstract (from CDS):
However, there are significant discrepancies between the observed and model light curves and spectra through the X-ray minimum. In particular, the hard flux in our synthetic spectra is an order of magnitude greater than observed. This suggests that the hard X-ray emission near the apex of the wind-wind collision region (WCR) `switches off' from periastron until two months afterwards. Further calculations reveal that radiative inhibition significantly reduces the pre-shock velocity of the companion wind. As a consequence the hard X-ray emission is quenched, but it is unclear whether the long duration of the minimum is due solely to this mechanism alone. For instance, it is possible that the collapse of the WCR on to the surface of the companion star, which would be aided by significant inhibition of the companion wind, could cause an extended minimum as the companion wind struggles to re-establish itself as the stars recede. For orbital eccentricities, e ≲ 0.95, radiative braking prevents a wind collision with the companion star's surface. Models incorporating a collapse/disruption of the WCR and/or reduced pre-shock companion wind velocities bring the predicted emission and the observations into much better agreement.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): hydrodynamics - stars: early-type - binaries: close - stars: individual: η Carinae - stars: winds, outflows - X-rays: stars
Simbad objects: 8
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