Gavin Ramsay

Surface brightness inhomogeneity on the helium-rich hot subdwarf in the X-ray binary HD 49798

Abstract 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 la...