X-Ray and UV Observations of the Contact Binary KIC 9832227

Abstract We investigate the X-ray and UV emission from contact binary star KIC 9832227, which was observed with XMM-Newton for one orbital cycle. The is detected an average luminosity of 3.4 × 10 30 erg s −1 . restricted to energies below 3 keV originates a multitemperature plasma temperatures up 1 keV. spectrum has at least two distinct components, cooler, mostly steady component, hotter component exhibiting significant variability. variable appears originate compact flare near region between stars that being eclipsed by secondary. analyze eclipse profile constrain location, size, density flaring region. remaining not could polar on primary or extended corona. exhibits same nearly sinusoidal modulation half period longer wavelengths. secondary eclipses have slightly different depths, generally attributed starspot activity. Using simulations light curve stellar atmosphere models, we deduce presence primary, determine time eclipse.