Accretion and outflow-related X-rays in T Tauri stars
Güdel, M.; Briggs, K.; Arzner, K.; Audard, M.; Bouvier, J.; Dougados, C.; Feigelson, E.; Franciosini, E.; Glauser, A.; Grosso, N.; Guieu, S.; Ménard, F.; Micela, G.; Monin, J.-L.; Montmerle, T.; Padgett, D.; Palla, F.; Pillitteri, I.; Preibisch, T.; Rebull, L.; Scelsi, L.; Silva, B.; Skinner, S.; Stelzer, B.; Telleschi, A.
Star-Disk Interaction in Young Stars
Proceedings of the International Astronomical Union
IAU Symposium, Volume 243, p. 155-162
(2007)
Abstract
We report on accretion- and outflow-related X-rays from T Tauri stars, based on results from the “XMM-Newton Extended Survey of the Taurus Molecular Cloud.” X-rays potentially form
in shocks of accretion streams near the stellar surface, although we hypothesize that direct interactions between the streams and magnetic coronae may occur as well. We report on the
discovery of a “soft excess” in accreting T Tauri stars supporting these scenarios. We further discuss a new type of X-ray source in jet-driving T Tauri stars. It shows a strongly
absorbed coronal component and a very soft, weakly absorbed component probably related to shocks in microjets. The excessive coronal absorption points to dust-depletion in the
accretion streams.
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