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Surface brightness inhomogeneity on the helium-rich hot subdwarf in the X-ray binary HD 49798
HD 49798 is an X-ray binary consisting of a hot helium-rich subdwarf primary and an accreting compact companion with an orbital period of 1.55 d. TESS observations of its optical light curve suggest short-period brightenings superimposed on a sinusoidal variation. The latter can be attributed to the
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