Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990acaps...9..289m&link_type=abstract
(Acta Astrophysica Sinica, vol. 9, no. 4, 1989, p. 289-297) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 14, March
Astronomy and Astrophysics
Astrophysics
Energy Spectra, Stellar Spectra, X Ray Binaries, Balloon-Borne Instruments, Stellar Luminosity, Telescopes
Scientific paper
The hard X-ray spectrum of Cyg X-1 in the 20-200 keV range obtained with
a balloon-borne CsI-NaI phoswich telescope launched at Xianhe, China, on
Sept. 22, 1985. The X-ray luminosity in 10-200 keV is estimated to be
(1.07 + or - 0.08) x 10 to the 37th erg/s, which indicates that Cyg X-1
may not be in the normal low state.
Li Guang-Hua
Ma Yu-Qian
Qian Yue-Min
Xiao Qian-Y.
Zhang Cheng-Muo
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