X-ray reflection in oxygen-rich accretion discs of ultra-compact X-ray binaries

O. K. Madej, J. Garcia, P. G. Jonker +4

We present spectroscopic X-ray data of two candidate ultra-compact X-ray binaries: 4U~0614+091 and 4U~1543$-$624. We confirm the presence of a broad O VIII Ly$\alpha$ reflection line (a…