CPD-41deg7742: an unusual wind interaction

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dc.creatorSana, H.
dc.creatorGosset, E.
dc.creatorRauw, G.
dc.creatorAntokhina, E.
dc.creatorRoyer, P.
dc.creatorManfroid, J.
dc.creatorVreux, J. -M.
dc.date2005-10-29
dc.date.accessioned2026-07-07T06:44:05Z
dc.date.available2026-07-07T06:44:05Z
dc.descriptionWe summarize the results of a multiwavelength observing campaign on the massive eclipsing binary CPD-41deg7742, another remarkable object in the young open cluster NGC 6231. Our campaign relies on high resolution echelle spectroscopy, narrow-band optical photometry, and XMM-Newton X-ray observations. Combined with the spectroscopic analysis, the light curve analysis provides a direct measurement of the masses and sizes of the system components. However, the most outstanding results come from the XMM-Newton observations. Our 180 ks campaign towards NGC 6231, and CPD-41deg7742, provides an unprecedented phase coverage of such a close early-type binary. The EPIC-MOS light curves almost fully cover the 2.4 day period of the system and the brightness of the object is sufficient to yield a time resolution as tight as 1 ks. The X-ray flux presents clear variations along the orbit, that we interpret as the signature of an unusual wind interaction. We indeed expect that, in this O+B system, the dominant primary wind crashes into the secondary surface, leading to a wind-photosphere interaction. As a strong support to our interpretation, we provide a geometrical model that associates an extra X-ray emission to the secondary inner surface. Though quite simple, the present model matches the main features of the X-ray light curve.
dc.description4pages, 5 figures, to appear in "Distant Worlds", proceedings of the JENAM2005
dc.identifierhttps://arxiv.org/abs/astro-ph/0510822
dc.identifierhttp://arxiv.org/abs/astro-ph/0510822
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/102656
dc.subjectAstrophysics
dc.titleCPD-41deg7742: an unusual wind interaction
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