Abstract
RADIO astronomers1–3 have recently discovered pulsars in Vela and near the Crab nebula which seem to be associated with supernova remnants and have repetition periods (0.0892 s and 0.0331 s) considerably shorter than those previously found. The very wide range (60-fold) of periods at present observed is difficult to understand if pulsars are in fact pulsating objects of a single class, because in general (period) ∝ (density)−1/2 and an extremely wide range of density would be required. Of the remaining clock mechanisms proposed, rotation4,5 seems most consistent with the observations. The extremely short periods exclude white dwarfs and make the suggestion of neutron stars more likely.
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GUNN, J., OSTRIKER, J. Magnetic Dipole Radiation from Pulsars. Nature 221, 454–456 (1969). https://doi.org/10.1038/221454a0
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DOI: https://doi.org/10.1038/221454a0
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