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- W2145808393 abstract "Accretion 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 <i>Chandra<i/>. 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." @default.
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- W2145808393 date "2009-04-16" @default.
- W2145808393 modified "2023-09-29" @default.
- W2145808393 title "The X-ray emission from Z Canis Majoris during an FUor-like outburst and the detection of its X-ray jet" @default.
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- W2145808393 doi "https://doi.org/10.1051/0004-6361/200911750" @default.
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