Paper:	X-rays From the Youngest Stars
Volume:	154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop
Page:	1123
Authors:	Montmerle, T.; Grosso, N.
Abstract:	We report X-ray observations with the ROSAT High Resolution Imager (HRI) of one of the nearest star-forming regions - the rho Ophiuchi cloud - that clearly show an intense X-ray flare associated with a deeply embedded protostar. The peak X-ray luminosity, after correcting for extinction, is >= 10-100 times the Sun's bolometric luminosity, and equals or exceeds the bolometric luminosity of the forming star. This suggests that the X-rays are not created by the type of magnetic activity seen on the Sun or on other young low-mass stars, but rather are associated with processes in the circumstellar accretion disk, or within the envelope. Other recent detections of X-ray emission from protostars are briefly reviewed.

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