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DC Field | Value | Language |
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dc.contributor.author | Chitnis, V. R | - |
dc.contributor.author | Agrawal, P. C | - |
dc.contributor.author | Manchanda, R. K | - |
dc.contributor.author | Rao, A. R | - |
dc.date.accessioned | 2007-05-09T08:24:16Z | - |
dc.date.available | 2007-05-09T08:24:16Z | - |
dc.date.issued | 1993 | - |
dc.identifier.citation | BASI, Vol. 21, pp. 555-559 | en |
dc.identifier.uri | http://hdl.handle.net/2248/1553 | - |
dc.description.abstract | We have studied X-ray binaries 4U1907 + 09, GX1 + 4 and Cygnus X-1 in the energy range 20-100 keV, using balloon-borne xenon-filled multilayer proportional counters flown from Hyderabad, India. Results of these observations are reported in this paper. X-ray binary 4U1907 + 09 was observed in 1985 and 1991. During 1985 the source was detected above 20 keV at a significance level of 13 sigma and was only marginally detected in 1991, indicating that the flux was four times lower than that on the first occasion. Energy spectrum between 20-100 keV obtained in 1985 was fitted with power-law with photon index -1.4. GX1 + 4 was observed in December 1991 and April 1992. The source showed a factor of two decrease in flux during the two observations. Hard X-rays spectra obtained on two occasions are found to be consistent with spectrum obtained from High Energy X-Ray Experiment (HEXE) experiment on board Kvant module. Cygnus X-1 was observed on several occasions from 1984 to 1992. There is an indication of Quasi-Periodic Oscillation (QPO) in April 1992 Cygnus X-1 observations as seen by SIGMA on board GRANAT and BATSE on board GRO. | en |
dc.format.extent | 329498 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | en | en |
dc.publisher | Astronomical Society of India | en |
dc.subject | X-ray binaries | en |
dc.title | Hard X-ray spectra of some X-ray binaries from balloon-borne observations | en |
dc.type | Article | en |
Appears in Collections: | BASI Publications |
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Paper_13.pdf | 321.78 kB | Adobe PDF | ![]() View/Open |
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