Discovery of X-ray pulsations from 2S 1417-624

Details Discovery of X-ray pulsations from 2S 1417-624 Discovery of X-ray pulsations from 2S 1417-624

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..251k&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 251-256. Research supported by the Indian Space Research Organization

Astronomy and Astrophysics

Astronomy

21

Binary Stars, Pulsars, X Ray Sources, Fourier Transformation, Neutron Stars, Pulsed Radiation, Satellite Orbits, X Ray Astronomy

Scientific paper

X-ray pulsations having a period of 17.64 sec are detected from the hard, variable galactic X-ray source 2S 1417-624. It is noted that the pulsations were found through a Fourier analysis of 40 satellite orbits of data taken with the rotation modulation collimators aboard SAS 3 in July 1978. The pulse profile shows detailed interpulse structure that is similar in character to the pulse profiles of 4U 0900-40 and A0535+26. Significant changes in pulse period are detected over the eight-day observing interval. It is suggested that these changes may be the result of a large intrinsic spin-up rate for the neutron star or from binary orbital motion, with orbital periods longer than approximately 15 days.

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