Tight surveillance of the exemplary O star zeta Ophiuchi with XMM-Newton and HST
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We propose a novel and decisive experiment that relies on the unrivaled jointcapabilities of XMM and HST. The closest Otype star, zeta Oph, shall beobserved continuously over its rotational period to reveal the physics ofstellar wind heating. We will discriminate between alternative models for Xrayproduction in O stars\\: the hot plasma is generated either in stochastic windshocks or in corotating interaction regions. The new superb Xray image willprobe the physical conditions in the circumstellar matter of an O star. Nosimilar observations were performed before on a massive star. Observing zeta Ophfor 80ks with XMM and 15 HST orbits will allow to study correlated Xray and UVvariability and achieve a breakthrough in our understanding of O stars. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]
