X-ray and optical observations of the pulsar NP 0532 in the Crab Nebula.
Pulsar NP 0532 in Crab Nebula observed by rocket and telescope showing strong pulsed X ray signal
Bradt, H.↗
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Analysis of the slowing-down rate of NP 0532.
NP 0532 slow down rate, using quadratic least squares method
Goldwire, H. C., Jr.↗
Infrared and optical measurements of the Crab pulsar NP 0532.
IR and optical measurement of Crab pulsar NP 0532, analyzing energy density per pulse and smoothness of visual data
Becklin, E. E.↗
Pulsed X-ray emission of NP 0532 in March 1968.
Pulsed X ray emission associated with pulsar NP 0532 in Crab Nebula measured by six element detector on Aerobee 150 rocket
Boldt, E. A.↗
Anomalous temporal behaviour of NP 0532
Temporal behavior of NP 0532 in radio and optical bands compared for second derivative of period
Holt, S. S.↗
Pulsar NP 0532 - Properties and systematic polarization of individual strong pulses at 430 MHz
Polarization of strong radio pulses from pulsar NP 0532 in Crab Nebula
Campbell, D. B.↗
Quasi-sinusoidal oscillation in arrival times of pulses from NP 0532
Crab Nebula pulsar NP 0532, describing quasi- sinusoidal oscillation in arrival times of radio pulses
Counselman, C. C., III↗
A pulsar hunter - Tests on NP 0532
Optical pulsar search instrument in radio pulsar fields, showing performance on NP 0532
Chiu, H.-Y.↗
Optical timing of the pulsar NP 0532 in the Crab Nebula
Crab Nebula pulsar NP 0532 optical timing, measuring frequency, arrival times and pulse interval
Cudaback, D.↗
Radio pulse shapes, flux densities, and dispersion of pulsar NP 0532
Crab Nebula pulsar NP 0532, examining radio pulse shapes, flux densities and dispersion
Campbell, D. B.↗
The X-ray spectra of the Crab Nebula and NP 0532
Crab Nebula and pulsar NP 0532 X ray spectra discussing pulse profile, emission and interstellar absorption
Chubb, T. A.↗
Gamma rays /250 keV-2.3 MeV/ from NP 0532
Pulsating gamma ray flux from pulsar NP 0532 in energy range from 250 keV to 2.3 MeV
Chupp, E. L.↗
A search for variations in the intensity of the optical pulses from NP 0532
Short time variability of intensity of optical pulses from pulsar NP 0532, using telescopes
Hegyi, D.↗
Observation of Pulsed Gamma Rays with Energies Greater than 250 keV from the Crab Nebula Pulsar NP 0532
Data from a balloon flight experiment using an Na I scintillation spectrometer were analyzed for gamma ray pulsation. The payload was carried to a nominal atmospheric depth of 3.5 g/cm2. A superposed epoch analysis was performed on a 12,000 second portion of the data spanning a total time interval of 16,700 seconds at float altitude. A positive pulsed contribution was observed at the expected apparent frequency of NP 0532 having the typical double pulse structure. The results indicate a time-averaged pulse photon flux of 0.00144 + or - 0.00057 photons/sq cm/sec in the energy interval from 250 keV to 2.3 MeV. This represents a time-averaged pulsed power of 0.000649 + or - 0.000257 keV/sq cm/sec/keV. The ratio of interpulse to main pulse was found to be 2.4 + or - 1.9. The analysis indicates a positive photon flux from 250 keV to 725 keV of 0.00120 + or - 0.00052 photons/sq cm/sec.
Orwig, L. E.↗
New observations of pulsed X-ray emission from NP 0532
Large-area proportional counters sensitive from 0.6 to 23 keV were used to observe about 3 min of pulsed X-ray emission from NP 0532 during two lunar-occultation experiments. A detailed pulse profile with 65-microsec resolution shows that the X-ray primary-pulse shape is essentially identical to its optical counterpart. Spectral data on the pulsed X-ray emission are presented. A pulse-by-pulse examination of the data shows no evidence for temporal variability.
Kestenbaum, H. L.↗
Transient structure in the high-energy X-ray light curve of NP 0532
The paper reports the observation of pulsed fractions in the primary and secondary peaks, as well as in the interpulse region, of the high-energy X-ray light curve of NP 0532. A statistical analysis of light-curve data is performed, and a similar analysis is carried out using simulated data. It is concluded that a previously reported third peak in the light curve was transient in nature.
Ryckman, S. G.↗
The potential of np GaAs solar cells for high efficiency concentrator applications
This communication considers the design of the front grid contact of np GaAs solar cells for high efficiency concentrator applications. This design involves shadowing, contact resistance, and active layer sheet resistance losses, and at high concentrations, the power loss due to voltage drop on the resistance of the grid fingers should be considered. Analysis of the performance can be calculated as a function of junction depth and surface recombination velocity. The junction depth can be optimized by considering its effect on the collection efficiency of the dark current-voltage characteristics or the open circuit voltage, and on the series resistance loss or the fill factor for material parameters. The choice of the material parameters, calculation of the short circuit current, the selection of the n layer thickness, and the cell maximum power and efficiency are discussed. It is concluded that optimized multi-grid structures should allow the use of 10 by 10 sq cm cells with good efficiencies at high concentration ratios, and efficiencies of 22 to 25% should be obtainable from large area cells at concentrations of 40 AM1.
Flat, A.↗
Recent results on the peformance of EFOS, NP and NX hydrogen masers
In response to a NASA Goddard Space Flight Center Work Assignment, Bendix Field Engineering Corporation evaluated the performance of the Oscilloquartz EPOS-2 hydrogen maser along with that of NASA NX-3 and NP-2 hydrogen masers in early 1983. This paper presents the results of that evaluation.
Reinhardt, V.↗