Discovery of 3.6-s X-ray pulsations from 4U0115+63

Details Discovery of 3.6-s X-ray pulsations from 4U0115+63 Discovery of 3.6-s X-ray pulsations from 4U0115+63

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.273..367c&link_type=abstract

Nature, vol. 273, June 1, 1978, p. 367-369. Research supported by the Zonta International and Alfred P. Sloan Foundation;

Astronomy and Astrophysics

Astronomy

47

Pulsed Radiation, X Ray Astronomy, Astronomical Models, Crab Nebula, Doppler Effect, Fourier Analysis, Mass Transfer, Position (Location), Radio Bursts, Sas, X Ray Sources, X Ray Spectra

Scientific paper

SAS 3 observations reveal a pulsation period of 3.61 sec for the transient X-ray source 4U0115+63. Positional measurement is accurate to approximately 30 arc s, and has led to the likely identification of an optical counterpart. The intensity of the pulses, as reported on 5.9 January 1978, is given as approximately 1.7 times that of the Crab Nebula (1-27 keV). Spectral information was also obtained from the ratios of counting rates in the first three energy channels of the center slat collimator detector (1-27 keV). Two classes of models are proposed to explain the transient nature of the X-ray sources: (1) episodic mass transfer in a binary system, and (2) eccentric binary orbits.

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