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  • ASTROPHYSICS  (4)
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  • 1
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    Pulsar PRS 0656 + 14 - Period and spindown (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Observations from various sources are used to explain the larger-than-expected period noted for pulsar 0656 + 14 on July 7, 1984 (Ashworth and Lyne, 1981). No indication of orbital motion was found, and most of the observations are consistent with a simple secular spindown. The derived period derivative of (54.3 + or - 1.3) x 10 to the -15th at epoch 2444300 is far greater than the previously reported value.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 161; 2, Ju; 303
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Pulsar fluctuation spectra and the generalized drifting-subpulse phenomenon. II (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Pulsar observations at meter wavelengths have been analyzed to investigate pulse-to-pulse variations and to identify regions of the pulse profile which display distinct statistical properties. Fluctuation spectra of eight recently discovered pulsars are presented along with a description of the drifting-subpulse phenomenon in several objects with quasiperiodic responses in their fluctuation spectra. A quantitative analysis of the drifting-subpulse phenomenon in PSR 0031-07 and PSR 0809+74 is given which emphasizes the broad-band nature of the phenomenon. A summary of the memory exhibited by pulsars with time scales of about 50 periods is given.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 197; Apr. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The Crab Nebula pulsar - Radiofrequency spectral variability (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 193; Oct. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Crab Nebula pulsar - Variability of dispersion and scattering (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Previous investigations of the effects of interstellar dispersion and scattering on the waveform of the Crab Nebula pulsar (NP 0532) have indicated a two-screen scattering model with one variable screen and have revealed anomalously large phase residuals at 73.8 MHz. The relevant observational data are reanalyzed in order to bring the two-screen model into better agreement with theoretical models of the interstellar medium and to account for the low-frequency (73.8-MHz) phase anomaly. The wavenumber spectrum of electron-density fluctuations is examined along with its role in scattering models involving an extended medium, a thick screen, or a thin screen. A tenable unit impulse response is constructed for a thin screen, its Fourier transform is analyzed, and an attempt is made to obtain the dispersion measure and scattering constants for two screens. A comparison of the resulting pulse-broadening and delay effects with other theoretical predictions shows that all observed pulse-broadening and delay effects in NP 0532 are consistent with scattering by a single thick slab of plasma occupying no more than one quarter of the line of sight.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 214
    Format: text
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    NASA TECHNICAL REPORTS
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