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Browsing by Author "Manchanda, R. K"

Browsing by Author "Manchanda, R. K"

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  • A double peaked pulse profile observed in GX 1 + 4 
    Paul, B; Agrawal, P. C; Rao, A. R; Manchanda, R. K (Astronomical Society of India, 1996)
    The hard X-ray pulsar GX 1+4 was observed several times in the last few years with a pair of balloon-borne Xenon filled Multi-cell Proportional Counters (XMPC). In a balloon flight made on 22 March 1995, the source was ...
  • Hard X-ray spectra of some X-ray binaries from balloon-borne observations 
    Chitnis, V. R; Agrawal, P. C; Manchanda, R. K; Rao, A. R (Astronomical Society of India, 1993)
    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 ...
  • HER X-1 observed in a low state 
    Paul, B; Agrawal, P. C; Rao, A. R; Manchanda, R. K (Astronomical Society of India, 1996)
    The X-ray pulsar Her X-1 was observed on 14th December, 1992 with two balloon borne Xenon filled multicell proportional counters (XMPC) from Hyderabad, India. The source intensity was found to be very low in the 20-100 KeV ...
  • Lunar Occulation of X-ray source in Crab Nebula 
    Manchanda, R. K (Astronomical Society of India, 1975-03)
  • Near absence of hard X-ray pulsation from GS 1843+00 in the middle of burst phase 
    Manchanda, R. K (Astronomical Society of India, 2000)
    Hard X-ray transient pulsar GS 1843+00 was observed in the 20-200keV region using a high sensitivity large area scintillation counter instrument during its 1997 flare on March 30. The data indicates a near absence of 29.5s ...
  • A new automatic star tracker for balloon-borne astronomy instruments 
    Madhwani, P. P; Manchanda, R. K (Astronomical Society of India, 2000)
    The tracking of an astronomical object requires continuous updating of the look angles in azimuth and zenith. The mathematical calculation of these angles needs the position coordinates (latitude and longitude) of the place ...
  • Observation of hard X-ray emission from extragalactic sources 3C 273 and NGC 5506 in 20-200 keV band 
    Manchanda, R. K (Astronomical Society of India, 2001)
    We report spectral measurements of the bright QSO 3C273 and the AGN source NGC 5506 made during a balloon flight experiment using high sensitivity scintillation counter telescope LASE, operating in the 20-200 keV energy ...
  • Observation of second cyclotron line feature in the spectrum of Her X-1 
    Manchanda, R. K (Astronomical Society of India, 2001)
    Hard X-ray spectrum of Her X-1 was measured during a balloon flight experiment launched on March 30, 1997 using a large area scintillation counter telescope. The instrument code named LASE, operates in the 20-200 keV energy ...
  • Pulse profiles of binary X-ray pulsars in 20-200 keV band 
    Manchanda, R. K (Astronomical Society of India, 2001)
    Hard X-ray observations of the binary X-ray pulsars were made using a balloon-borne large area scintillation counter telescope in the 20-200 keV band. Apart from many other galactic and extragalactic X-ray sources, three ...

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