Other
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179p..35d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 179, Apr. 1977, p. 35P-39P.
Other
14
Energy Spectra, Periodic Variations, Satellite Observation, X Ray Sources, Ariel 5 Satellite, Energy Bands, Galactic Radiation, Light Curve, Power Spectra, Proportional Counters, Radiant Flux Density, X Ray Spectra
Scientific paper
An analysis of Ariel V quadrant-mode data obtained when the source 3U 1538-52 was within the field of view of the collimated proportional counter is described. The results are shown to indicate the presence of another, substantially weaker source designated A1540-53. It is found that this weaker source has a hard power-law spectrum with a number exponent of approximately -1.1 and exhibits a clear modulation at a period of about 8.81 min. The pulsed fraction is determined to be 25% of the total flux in the energy band from 1.8 to 5.6 keV.
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