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Re-assessment of the Accretion Disc Clock in Hercules X-1

  • E. Jurua (a1) (a2), M. Still (a3), P. J. Meintjes (a1), P. A. Charles (a4) and S. K Anguma (a1)...

Abstract

The Galactic neutron star X-ray binary Her X-1 shows a 35-day photometric modulation. Detected across a broad energy range, the modulation is prevalent in X-rays, cycling between low and high states. Since the discovery of the 35-day cycle of Her X-1, the X-ray source has entered and returned from an extended anomalous low state on at least seven occasions. Employing Rossi X-ray Timing Explorer All-Sky Monitor observations, prior predictions that Her X-1 would return from the 2003 - 2004 anomalous low state with a new precession period and accretion luminosity are verified. However, the precession has not been as coherent over recent years as predicted. Potentially there have been more minor anomalous low states between 2004 and the present day.

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References

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Giacconi, R., Gursky, H., Kellogg, E., et al. 1973 ApJ, 184, 227
Leahy, D. A. & Igna, , 2010 ApJ 10, 10
Leahy, D. A. & Marshall, H., 1999 ApJ, 521, 328
Leahy, D. A. & Scott, D. M., 1998, ApJ 503, L63
Middleditch, J. & Nelson, J., 1976 ApJ, 208, 567
Reynolds, A. P., Quaintrell, H., Still, M. D., et al. 1997 MNRAS, 288, 43
Scott, D. M., Leahy, D.A.,& Wilson, R. B., 2000 ApJ, 539, 392
Still, M. & Boyd, P., 2004 ApJ, 606, L135
Tananbaum, H., Gursky, H., Kellogg, E. M., et al. 1972 ApJ, 174, L145
Wijers, R. A. M. & Pringle, J. E., 1999 MNRAS, 308, 207
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Re-assessment of the Accretion Disc Clock in Hercules X-1

  • E. Jurua (a1) (a2), M. Still (a3), P. J. Meintjes (a1), P. A. Charles (a4) and S. K Anguma (a1)...

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