Abstract
As discussed in the accompanying lecture notes on “Neutron stars in X-ray binaries”, two broad groups of X-ray binaries can be distinguished on the basis of their X-ray spectra, their X-ray variability characteristics and their optical properties; these are the high-mass X-ray binaries (HMXB) and the low-mass X-ray binaries (LMXB). In this lecture the orbital variations of the optical brightness of these systems are discussed in the framework of a relatively simple model, in which contributions to the optical emission from the companion and the accretion disk, their mutual eclipses, and reprocessing of X rays in matter surrounding the X-ray source, are included.
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