Discovery of 13.5 S X-ray pulsations from LMC X-4 and an orbital determination

Details Discovery of 13.5 S X-ray pulsations from LMC X-4 and an orbital determination Discovery of 13.5 S X-ray pulsations from LMC X-4 and an orbital determination

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..568k&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 568-574.

Other

62

Binary Stars, Magellanic Clouds, Neutron Stars, X Ray Sources, Companion Stars, Fourier Transformation, Power Spectra, Radial Velocity, Radii, Stellar Flares, Stellar Mass

Scientific paper

X-ray pulsations with a 13.5-sec period have been detected from the 1.4-d X-ray binary LMC X-4. By measuring the apparent pulse period at several binary orbital phases, and assuming the orbit to be nearly circular, the semimajor axis of the orbit is determined to be 30 + or - 5 ly-sec. This result, together with a revised orbital velocity amplitude of 37.9 + or - 2.4 km/sec, and other available information, suffice for the determination of the component masses of the binary system and the radius of the companion star. The mass of the neutron star is found to be 1.6 +1.0 -0.5 solar masses, while the mass, radius, and effective temperature of the companion star indicate that it may be undermassive for its luminosity.

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