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  • 1
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    Limits on rapid X-ray pulsing in X-ray binaries (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A recent sounding rocket experiment in which the X-ray variations of Cir X-1 and Vela X-1 were investigated at time resolutions down to 1 msecond is described. Sporadic flaring activity in the X-ray sources was observed on time scales from 1 to several seconds, corresponding to intensity changes of about 20% in Cir X-1 and up to 100% in Vela X-1. Periodic, aperiodic, or quasi-periodic pulsations were not detected with time constants less than 1 second. The limits of rapid X-ray pulsations are shown to range from 3 to 15% for Cir X-1, Cyg X-1, Vela X-1, and 3U 1700-37.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 190; June 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    X-ray pulse profile and celestial position of Hercules X-1. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The celestial position of the binary X-ray source Her X-1 has been measured with a precision of 30 sec and, within the uncertainties, agrees with the position of the optical variable HZ Herculis. An average light curve for the 1.24-sec periodicity has been obtained with about 10-msec resolution. The average pulse is a double-peaked structure which shows significant intensity changes in time scales down to 30 msec.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 182; May 15
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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