X-ray Emission from the FU Orionis Star V1735 Cygni

Abstract

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 arcsecs 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.

25 pages, 6 figures

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• The X-ray emission from Z CMa during an FUor-like outburst and the detection of its X-ray jet
• The JCMT Gould Belt Survey: A First Look at IC 5146
• X-raying the Beating Heart of a Newborn Star: Rotational Modulation of High-energy Radiation from V1647 Ori
• Are the outflows in FU Orionis systems driven by the stellar magnetic field?
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• X-ray Production by V1647 Ori During Optical Outbursts
• Chandra Reveals Variable Multi-Component X-ray Emission from FU Orionis
• Chandra Resolves the Double FU Orionis System RNO 1B/1C in X-rays
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