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High-energy gamma-ray and hard X-ray observations of Cyg X-3COS-B viewed the Cyg X-3 region seven times between November, 1975, and February, 1982; a search for steady gamma-ray emission pulsed at the characteristic 4.8-hour period did not reveal its source. Leiden-MIT balloon experiment observations of Cyg X-3 in May, 1979 show the 4.8-hour modulation with sinusoidal light curve and modulation depth of 0.30, for energies of up to about 140 keV. The strong variability of Cyg X-3 over more than one order of magnitude at energies below 20 keV does not emerge in the data collected at hard X-ray energies.
Document ID
19870052076
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hermsen, W.
(Leiden Univ. Netherlands)
Bloemen, J. B. G. M.
(Leiden Univ. Netherlands)
Jansen, F. A.
(Leiden Rijksuniversiteit, Netherlands)
Bennett, K.
(ESA Space Science Dept., Noordwijk, Netherlands)
Buccheri, R.
(CNR Istituto di Fisica Cosmica e Informatica, Palermo, Italy)
Mastichiadis, A.
(Leiden Univ. Netherlands)
Mayer-Hasselwander, H. A.
(Leiden Univ. Netherlands)
Strong, A. W.
(Max-Planck-Institut fuer Physik und Astrophysik Garching, Germany)
Oezel, M. E.
(NASA Goddard Space Flight Center Greenbelt, MD; Max-Planck-Institut fuer Radioastronomie, Bonn, W, United States)
Pollock, A. M. T.
(CEA, Service d'Astrophysique, Gif-sur-Yvette, France; Birmingham, University United Kingdom)
Date Acquired
August 13, 2013
Publication Date
March 1, 1987
Publication Information
Publication: Astronomy and Astrophysics
Volume: 175
Issue: 1-2,
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
87A39350
Distribution Limits
Public
Copyright
Other

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