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Recent Optical Observations of the X-Ray Source H0139-68; an AM-Herculis Type Binary System

Published online by Cambridge University Press:  25 April 2016

A.J. Pickles  and
N. Visvanathan
A.J. Pickles
Affiliation:
Mount Stromlo and Siding Spring Observatories, A.N.U.
N. Visvanathan
Affiliation:
Mount Stromlo and Siding Spring Observatories, A.N.U.
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Extract

The soft X-ray source HO 139-68 was originally detected with the low energy detectors of the HEAO A-2 experiment, and confirmed by later IPC observations (Agarwal et al. 1981). The X-ray observations show flux variations in the 0.15 – 0.4 keV band of a factor of two, or timescales of a few hours, with evidence for short time-scale flickering. Following communication of the source position to us by Agarwal and Riegler, we obtained time-resolved optical spectrophotometry of a star close to the X-ray position, using the IDPCA on the MSO 1.9m telescope. The spectrophotometry and later polarisation observations confirm the optical identification and that the source is an AM-Herculis type binary system, with a late type dwarf secondary overflowing its Roche lobe in a magnetically constrained funnel onto a magnetic white dwarf (WD) primary (Visvanathan and Pickles 1982).

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Contributions
Information
Publications of the Astronomical Society of Australia , Volume 4 , Issue 4 , 1982 , pp. 425 - 428
Copyright
Copyright © Astronomical Society of Australia 1982

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References

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