期刊
ASTROPHYSICAL JOURNAL
卷 696, 期 1, 页码 766-774出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/696/1/766
关键词
stars: individual (V1735 Cyg = Elias 1-12); stars: pre-main sequence; X-rays: stars
资金
- NASA [NNX06AE93G, NNG05GE69G]
- ESA
- USA (NASA)
- NASA Goddard Space Flight Center
The variable star V1735 Cyg (=Elias 1-12) lies in the IC 5146 dark cloud and is a member of the class of FU Orionis objects whose dramatic optical brightenings are thought to be linked to episodic accretion. We report the first X-ray detections of V1735 Cyg and a deeply embedded class I protostar lying 24 '' to its northeast. X-ray spectra obtained with EPIC on XMM-Newton reveal very high-temperature plasma (kT > 5 keV) in both objects, but no large flares. Such hard X-ray emission is not anticipated from accretion shocks and is a signature of magnetic processes. We place these new results into the context of what is presently known about the X-ray properties of FU Orionis stars and other accreting young stellar objects.
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