Balloon observation of the binary X-ray source HER X-1 1.24 SEC pulsation and cyclotron line emission

Details Balloon observation of the binary X-ray source HER X-1 1.24 SEC pulsation and cyclotron line emission Balloon observation of the binary X-ray source HER X-1 1.24 SEC pulsation and cyclotron line emission

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978esasp.135..299r&link_type=abstract

In ESA European Sounding Rocket, Balloon and Related Res. with Emphasis on Expt. at High Latitudes p 299-303 (SEE N79-31637 22

Computer Science

Sound

Binary Stars, Cosmic X Rays, Cyclotron Radiation, Hercules Nova, X Ray Astronomy, Balloon Sounding, Line Spectra, Pulsed Radiation, Stellar Magnetic Fields, X Ray Spectra

Scientific paper

During a balloon observation from Palestine, Texas, the 1.24 sec pulsation of Hercules X - 1 in the hard X-ray range up to 70 keV was detected and strong line emission in its spectrum at 58 keV was discovered. A line flux of 0.003 photons/cm sq/sec and a line width of less than 12 keV was estimated. The phenomenon is thought to be caused by electron cyclotron emission at the basic frequency which is emitted by the hot polar plasma of the rotating neutron star. The line measured leads to a magnetic field strength of 5.3 x 10 to the 12th power Gauss. From further observations during a balloon campaign in 1977 it was confirmed that the line emission exists and that pulsed X-ray emission above 15 keV during the 'Short On' and 'Off'-state of the Her X-1 35 day cycle had been found. The pulse to interpulse ratio seems to vary with the 35 day phase.

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