Evidence for a 581-d modulation in the pulse period of 3U0352 + 30

Details Evidence for a 581-d modulation in the pulse period of 3U0352 + 30 Evidence for a 581-d modulation in the pulse period of 3U0352 + 30

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.267..229w&link_type=abstract

Nature, vol. 267, May 19, 1977, p. 229, 230. Research supported by the Science Research Council.

Computer Science

35

Frequency Distribution, Neutron Stars, Pulse Modulation, Stellar Rotation, X Ray Sources, Amplitude Modulation, Angular Velocity, B Stars, Circular Orbits, Companion Stars, Orbital Velocity, Phase Modulation

Scientific paper

A search for a modulation in the pulsation period of the X-ray source 3U 0352+30 (identified with the Be star X Per) due to 22-hr orbital motion is reported. An upper limit of 200 km/sec is set on angular velocity for periods in the range from 11 to 60 hr, and upper limits on the orbital inclination are given for three periods, assuming a 20-solar-mass primary and a two-solar-mass secondary in circular orbit. Observed fluctuations in the mean heliocentric period of the 13.9-min modulation are analyzed and correlated with the previously reported 581-day optical period. The data are shown to be consistent with a model in which the X-ray pulse period is modulated at the same period, phase, and amplitude as the optical modulation, provided an overall downward trend in pulse period is assumed. It is suggested that 3U 0352+30 is a spinning neutron star uniquely associated with X Per and that both objects are orbiting an unseen companion of several tens of solar masses in a triple system.

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