The X-ray eclipse geometry of CAL 87

摘要: We explore XMM-{\it Newton} observations of the eclipsing super-soft X-ray source CAL~87 in order to map accretion structures system. { Indirect imaging techniques were applied light curves provide eclipse maps}. The surface brightness distribution exhibits an extended and symmetric emission, from hardest X-rays is revealed a feature that likely due bright spot}. A rate $\dot{P} = (+6\pm2) \times 10^{-10}$ for changes orbital period system was derived eclipses. There no significant variation emission lines even during eclipses, arguing are formed region. continuum dominates decrease flux which observed O\,{\small VIII} Ly$\alpha$ line reveals broadening velocity is} estimated 365$^{+65}_{-69}$ km\,s$^{-1}$ (at 1$\sigma$) marginal evidence asymmetry its profile, sometimes shows double-peaked emission. Together, results support wind-driven mass transfer scenario running CAL~87.