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dc.contributor.authorStelzer, Beate
dc.contributor.authorHubrig, Swetlana
dc.contributor.authorOrlando, Salvatore
dc.contributor.authorMicela, Giusi
dc.contributor.authorMikulášek, Zdeněk
dc.contributor.authorSchöller, Marcus
dc.identifier.citationAstronomy & astrophysics. 2009, vol. 499, no. 2, p. 529-533.en
dc.description.abstractAccretion shocks have been recognized as an important X-ray emission mechanism for pre-main sequence stars, and yet the X-ray properties of FUor outbursts, events that are caused by violent accretion, have been given little attention. We observed the FUor object Z CMa during optical outburst and quiescence with Chandra. No significant changes in X-ray brightness and spectral shape were found, suggesting that the X-ray emission is coronal. The binary nature of Z CMa makes the origin of the X-ray source ambiguous. However, the moderate hydrogen column density derived from our data makes it unlikely that the embedded primary star is the X-ray source. The secondary star, which is the FUor object, is thus responsible for both the X-ray emission and the ongoing accretion outburst, which seem, however, to be unrelated phenomena. The secondary is also known to drive a large outflow and jet, which we detect here for the first time in X-rays. The distance of the X-ray emitting outflow source to the central star is greater than in jets of low-mass stars.en
dc.publisherEDP Sciencesen
dc.relation.ispartofseriesAstronomy & astrophysicsen
dc.subjectX-rays: starsen
dc.subjectaccretion disksen
dc.subjectstars: pre-main sequenceen
dc.subjectstars: variables: generalen
dc.subjectstars: activityen
dc.subjectstars: windsen
dc.titleThe X-ray emission from Z Canis Majoris during an FUor-like outburst and the detection of its X-ray jeten
dc.identifier.locationNení ve fondu ÚKen

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