X-ray Emission from FU Orionis Stars in Cygnus

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Stars, White Dwarfs, Solar System, V1515 Cyg, V1735 Cyg, Xmm-Newton Proposal 04028402

Scientific paper

FU Orionis objects (FUors) are young low-mass pre-main sequence (PMS) stars that are undergoing accretion at maximum rates 10e-4 solar masses per year. Classical FUors have all experienced optical outbursts attributed to a sudden increase in the disk accretion rate. Very little is known about the X-ray properties of these unusual stars. We initiated a X-ray survey of FUors with XMM-Newton in AO-3 and the prototype FU Ori has been detected. Its X-ray spectrum is very unusual compared to what is typically observed in PMS stars. We propose here to complete our X-ray survey of FU Ors. These observations will allow us to define the X-ray properties of the class and will serve as a valuable historical reference if any of our targets undergoes a future outburst.

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