LMC X-4 - 13.5 S pulsations and an X-ray flare observed by EXOSAT

Details LMC X-4 - 13.5 S pulsations and an X-ray flare observed by EXOSAT LMC X-4 - 13.5 S pulsations and an X-ray flare observed by EXOSAT

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..371p&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

30

Stellar Flares, Stellar Oscillations, X Ray Binaries, Eclipses, Spectrum Analysis, Stellar Mass, Stellar Orbits

Scientific paper

Exosat observed LMC X-4 on November 17/19, 1983 for one 1.4-day binary period during the high state of the 30.5 day cycle. An eclipse with sharp ingress and slow egress was detected with an eclipse angle of 27.1 plus or minus 1.0 deg. In the medium energy experiment the source showed a hard power law spectrum. Outside eclipse the source was remarkably constant and only one flare was detected on November 17 at 19 UT lasting for about 1 h. The energy spectrum of the source softens considerably during that time and shows an emission line of cold iron. 13.5 sec pulsations are strongly present during the flare and have also been detected during the quiescent period and during several 1 min flares in another Exosat LMC X-4 observation on November 22, 1983. A pulse delay time analysis results in the determination of the pulse period (13.5019 plus or minus 0.0002) s and of the semimajor axis of the orbit of the X-ray star (26.0 plus or minus 0.6) 1t-sec. These results, together with other available information on LMC X-4, allowed to improve the binary parameters. The mass of the neutron star is found to be 1.34 + 0.48 or -0.44 solar mass (95 percent confidence errors).

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