Analysis of the optical light curve of the massive X-ray binary LMC X-4

Details Analysis of the optical light curve of the massive X-ray binary LMC X-4 Analysis of the optical light curve of the massive X-ray binary LMC X-4

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...223..154h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 223, no. 1-2, Oct. 1989, p. 154-164.

Astronomy and Astrophysics

Astrophysics

41

Accretion Disks, Light Curve, X Ray Binaries, Brightness Distribution, Companion Stars, Stellar Spectrophotometry

Scientific paper

The long-term X-ray and optical brightness variations of LMC X-4 (period about 30 days) have been explained qualitatively as a result of a tilted counter-precessing accretion disk, as in the case of Her X-1 and SS 433. The optical light curve of LMC X-4 is analyzed using a geometric model which incorporates ellipsoidal variations, X-ray heating of the companion star. The effects of a precessing accretion disk (as a source of optical emission, partial X-ray shielding of the companion, and mutual eclipses) are also discussed. Although some discrepancies remain, the model provides a reasonable description of the 30-d variations of the orbital light curve of LMC X-4.

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