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2004MNRAS.350..809S - Mon. Not. R. Astron. Soc., 350, 809-828 (2004/May-3)
A phase-resolved XMM-Newton campaign on the colliding-wind binary HD 152248.
SANA H., STEVENS I.R., GOSSET E., RAUW G. and VREUX J.-M.
Abstract (from CDS):
We also perform 2D hydrodynamical simulations using different sets of parameters that closely reproduce the physical and orbital configuration of the HD 152248 system at the time of the six XMM-Newton pointings. This allows a direct confrontation of the model predictions with the constraints deduced from the X-ray observations of the system. We show that the observed variation of the flux can be explained by a variation of the X-ray emission from the colliding-wind zone, diluted by the softer X-ray contribution of the two O-type stars of the system. Our simulations also reveal that the interaction region of HD 152248 should be highly unstable, giving rise to shells of dense gas that are separated by low-density regions.
Finally, we perform a search for short-term variability in the light curves of the system and we show that trends are present within several of the 30-ks exposures of our campaign. Further, most of these trends are in good agreement with the orbital motion and provide a direct constraint on the first-order derivative of the flux. In the same context, we also search for long-range correlations in the X-ray data of the system, but we only marginally detect them in the high-energy tail of the signal.
Abstract Copyright: 2004 RAS
Journal keyword(s): binaries: close - stars: early-type - stars: individual: HD 152248 - stars: winds, outflows - X-rays: individual: HD 152248 - X-rays: stars
Simbad objects: 9
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