An investigation into the nature of the 4.4 HR periodic source 4U1755 - 33

Details An investigation into the nature of the 4.4 HR periodic source 4U1755 - 33 An investigation into the nature of the 4.4 HR periodic source 4U1755 - 33

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..213p&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

6

Galactic Nuclei, X Ray Astronomy, X Ray Sources, Energy Spectra, Exosat Satellite, Light Curve, Metallicity, Neutron Stars, Spectrum Analysis

Scientific paper

The results of a continuous 18-hour observation of 4U1755 - 33 made with the European Space Agency's Exosat Observatory are presented. Four 50-min dips in X-ray intensity were observed, equally spaced with a period of 4.4 hrs, confirming the periodicity first suggested in White et al. (1984). The dips are spectrally independent. After examining the properties of 4U1755 - 33 it was concluded that the source is most probably point-like, and that the metallicity of the absorbing material is at least 600 times less than cosmic values.

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