Oct 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.224..157v&link_type=abstract
Nature, Volume 224, Issue 5215, pp. 157-159 (1969).
Physics
7
Scientific paper
RECENT discoveries have made the interpretation of pulsars as neutron stars quite attractive. But the magnitude and the scattering of the periods, which range from 0.033 s to 3.7 s, indicate that it is improbable that these are pulsation periods, and it has become common to associate these periods with periods of rotation. The discovery1 of a second periodic pulsation in AP 2015 + 28 and CP 1919, and its probable existence in CP 0950 and CP 1133, suggest that the existence of two pulsation periods may be common to all pulsars. Drake and Craft1 have tentatively associated this second period with the pulsation period of the star. Cameron and Cohen2 have shown this to be unlikely, at least for AP 2015 + 28 and CP 1919, whose periods are P2= 10.6879 ms and P2 = 15.5089 ms respectively, because bodies intermediate between white dwarfs and neutron stars, which would pulsate with periods of this magnitude, are not gravitationally bound.
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