Binary modulation and transient periodic variations in X-ray emission from the AM HER binary H0139-68

Singh, K. P. ; Agrawal, P. C. ; Riegler, G. R. (1984) Binary modulation and transient periodic variations in X-ray emission from the AM HER binary H0139-68 Monthly Notices of the Royal Astronomical Society, 208 . pp. 679-685. ISSN 0035-8711

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Official URL: http://adsabs.harvard.edu/abs/1984MNRAS.208..679S

Abstract

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.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Binary Stars; Spaceborne Astronomy; X Ray Astronomy; X Ray Stars; HEAO 1; Periodic Variations; Power Spectra; Transient Response
ID Code:59044
Deposited On:03 Sep 2011 17:37
Last Modified:12 Jul 2012 15:13

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