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The Einstein survey of the young stars in the Orion NebulaThe Orion Nebula is the best studied site of recent star formation in the Galaxy. The complete Einstein Observatory survey of the Orion Nebula covering a 2 deg x 2 deg region centered on the Trapezium is reported. An X-ray mosaic is presented for the Nebula along with a complete X-ray catalogue for this very young cluster. Approximately 150 distinct sources were found in this 4 sq deg region; spectral types and colors were obtained for about 1/2 of the optical counterparts of these sources. Comparison of the variability of the Orion X-ray sources with those found in the Rho Ophiuchi cloud leads to the conclusion that the Orion sources' variability is also likely to result from continual flaring activities. Eleven new late B stars associated with X-ray emission far exceeding that expected from early type stars were discovered. The X-rays may originate from pre-main sequence companions to these stars; a T-Tauri star of the same age would have the correct L sub x. Comparison of the solar type stars in Orion with those in the Pleiades, the Hyades, and the field suggests that the decay of activity with age is most appropriately described by an exponential, rather than a power law fit.
Document ID
19880003800
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Zoonematkermani, S.
(Columbia Univ. New York, NY, United States)
Caillault, J.-P.
(Joint Inst. for Lab. Astrophysics Boulder, Colo., United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1987
Publication Information
Publication: Colorado Univ., 5th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
Subject Category
Astrophysics
Accession Number
88N13182
Funding Number(s)
CONTRACT_GRANT: NAG8-582
CONTRACT_GRANT: NAG8-497
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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