Abstract
FOLLOWING the report from Ariel V (ref. 1) of substantial X-ray emission from Her X-1 midway through the extended low-state portion of its 35-d cycle, Jones and Forman2 have reported a similar feature during another cycle, measured from Uhuru. They further suggest that this feature should occur regularly, consistent with models for the mass accretion disk which are inclined with respect to the binary orbital plane3,4. We report here the results of the analysis of > 500 d of Ariel V all-sky monitor (ASM) data, which support the view that the feature occurs regularly in the 35-d cycle.
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References
Cooke, B. A., and Page, C. G., Nature, 256, 712 (1975).
Jones, C., and Forman, W., Astrophys. J. Lett. (in the press).
Roberts, W. J., Astrophys. J., 187, 575 (1975).
Gerend, D., and Boynton, P. E., Astrophys. J. (in the press).
Holt, S. S., Astrophys. Space Sci., 42, 123 (1976).
Giacconi, R., et al., Astrophys. J. 184, 227 (1973).
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HOLT, S., BOLDT, E., KALUZIENSKI, L. et al. The 35-d X-ray profile of Her X-1. Nature 263, 484–485 (1976). https://doi.org/10.1038/263484a0
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DOI: https://doi.org/10.1038/263484a0
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