Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..271m&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 1, 1982, p. 271-278. Navy-NASA-supported research.
Astronomy and Astrophysics
Astrophysics
28
Balloon-Borne Instruments, Binary Stars, Light Curve, Spectrum Analysis, X Ray Sources, X Ray Spectra, Cosmic X Rays, Photon Density, Power Spectra, Pulsars, Pulsed Radiation, Scintillation Counters, Thermal Radiation
Scientific paper
A number of X-ray sources were observed with the Naval Research Laboratory hard X-ray observatory during balloon flights on 1976 May 11 and 1977 November 24. The primary objective of the observations was to characterize the temporal and spectral behavior of the sources in the energy range from 20 to 250 keV. Special emphasis was placed on the determination of spectrum versus phase for periodic sources and on the search for spectral features such as the reported 60 keV line in the X-ray spectrum of Her X-1. Results of the observations include: evidence for possible phase-dependent spectral variations in the emission from GX 1+4; flaring in the emission from GX 301-2; detection of unmodulated X-ray emission up to approximately 35 keV from GX 304-1; and an unexpectedly hard spectrum above 20 keV from Cyg X-2.
Johnson Neil W.
Kurfess James D.
Maurer G. S.
Strickman Mark S.
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