Abstract
AFTER the discovery of the first pulsating radio source CP 1919 (ref. 1), Liller2 obtained a preliminary proper motion based on two Harvard patrol plates, epoch 1938 and 1940. Six more pulsars were later discovered, but two of them could not be optically identified, at least not to a plate limit of twenty-third magnitude3.
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References
Hewish, A., Bell, S. J., Pilkington, J. D. H., Scott, P. F., and Collins, R. A., Nature, 217, 709 (1968).
Liller, W., IAU Circ. 2060 (1968).
Arp, H. C., Sky and Telescope, 36, No. 1, 7 (1968).
Lu, P. K., Astron. J. (in the press).
Arp, H. C., Sargent, W. L. W., and Schmidt, M., Sky and Telescope, 36, No. 1, 7 (1968).
Lynds, C. R., Maran, S. P., and Trumbo, D. C., Science, 161, 42 (1968).
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Lu, P. Proper Motion of the Blue Star in the Field of Pulsar CP 1919. Nature 220, 356 (1968). https://doi.org/10.1038/220356a0
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DOI: https://doi.org/10.1038/220356a0
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