Further x-ray observations of Hercules X-1 from Uhuru
Journal Article
·
· Astrophys. J., v. 184, no. 1, pp. 227-236
OSTI ID:4317352
Recent data are presented concerning the X-ray source Hercules X-1. Details of the 1.24-second pulse shape and its variability are shown. The 1.24- second period is observed to decrease with time, with an overall change of 4.5 mu s between 1972 January and July. The X-ray intensity shows regular on states lasting 11 or 12 days followed by 24-day off states. While ihe source turu-on is not strictly periedic, the shape of the on state can be used to determine a period of 34.88 plus or minus 0.12 days for this cycle. The source turn-ons are found to only occur at one of two well-defined phases in the 1.7-day orbit. In addition to the regular 1.7-day eclipses, regular dips in the X-ray intensity are seen, whose occurrence is related to the orbital phase. These dips are interpreted as absorption by gas in thc system. (auth)
- Research Organization:
- American Science and Engineering, Inc., Cambridge, Massachusetts
- NSA Number:
- NSA-29-021931
- OSTI ID:
- 4317352
- Journal Information:
- Astrophys. J., v. 184, no. 1, pp. 227-236, Journal Name: Astrophys. J., v. 184, no. 1, pp. 227-236; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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