Orbital Decay in the X-Ray Binary LMC X-4

Details Orbital Decay in the X-Ray Binary LMC X-4 Orbital Decay in the X-Ray Binary LMC X-4

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456l..37s&link_type=abstract

Astrophysical Journal Letters v.456, p.L37

Astronomy and Astrophysics

Astronomy

6

Stars: Binaries: Eclipsing, Stars: Individual Alphanumeric: Lmc X-4, Stars: Neutron, X-Rays: Stars

Scientific paper

We report on the timing analysis of the high-mass X-ray binary (HMXRB) LMC X-4 with the ROSAT satellite. The observation covers about three binary orbits in the high-intensity state of the 30 day cycle of LMC X-4, thus allowing an accurate determination of the pulse period and the orbital parameters of the 13.5 s X-ray pulsar. The new mid-eclipse epoch, combined with the previous epochs, suggests orbital decay in LMC X-4 at a rate of P dot _{{orb}}/P_{{orb}} ~ -5 x 10-7 yr-1. An interpretation of our results is discussed in the context of conservative mass loss and tidal evolution and in comparison with the other HMXRB Cen X-3.

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