Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..679s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, June 1, 1984, p. 679-685.
Astronomy and Astrophysics
Astronomy
11
Binary Stars, Spaceborne Astronomy, X Ray Astronomy, X Ray Stars, Heao 1, Periodic Variations, Power Spectra, Transient Response
Scientific paper
The authors present the results of a detailed timing analysis of the soft X-ray data on the AM Her type binary H0139-68, obtained with HEAO-1 and Einstein satellites. It is demonstrated that the X-ray flux from H0139-68 is modulated at the 113.6363 min orbital period of its optical counterpart. The imaging proportional counter (IPC) data obtained with the Einstein satellite show a high and low state in the X-ray source, consistent with the binary modulation seen in the HEAO-1 data. Transient X-ray pulsations with a period of ≡275 s are observed in the IPC data during the high state. It is shown that the present optical and X-ray data rule out the presence of an accretion disc in the binary system.
Agrawal Prahlad C.
Riegler Guenter R.
Singh Kamal P.
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