Properties of the 2-6 keV pulse profiles of hercules X-1
Journal Article
·
· Astrophys. J.; (United States)
We have reanalyzed Uhuru data of 2--6 keV X-ray pulsations from Hercules X-1 during three high states of the source. We find that the pulse amplitude and pulsed fraction vary systematically with 1.7 day orbital phase and with phase in the 35 day high-low cycle of the source. However, the shapes of the pulsations otherwise show little variation with time, and the intensity of unpulsed X-rays does not vary greatly during most of each high state. From Monte Carlo simulations of the data, we find that the observations are consistent with no pulse-to-pulse shape fluctuations and with small but nonzero extrastatistical intensity fluctuations on time scales between approx.0.1 and approx.10 s. Our results support models wherein the 35 day cycle is due to variable obscuration of the X-ray star by a wobbling accretion disk.
- Research Organization:
- Alfred P. Sloan Research Fellow
- OSTI ID:
- 6774826
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 225:3; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Average 2-6 keV pulse shapes of Hercules X-1 during the January 1972 ''on'' state
Hard x-ray spectrum of Hercules X-1
Uhuru observations of Hercules X-1 during the low state of the 35-day cycle
Conference
·
Wed Oct 15 00:00:00 EDT 1975
· Ann. N.Y. Acad. Sci.; (United States)
·
OSTI ID:7192935
Hard x-ray spectrum of Hercules X-1
Journal Article
·
Mon Jul 23 00:00:00 EDT 1973
· Nature (London) Phys. Sci., v. 244, no. 134, pp. 59-60
·
OSTI ID:4433543
Uhuru observations of Hercules X-1 during the low state of the 35-day cycle
Journal Article
·
Sun Oct 31 23:00:00 EST 1976
· Astrophys. J., Lett.; (United States)
·
OSTI ID:7245391