Binary star
X - Ray Binaries produce great amounts of X-ray radiation. They result from a massive star eating a less massive star. The lesser star becomes a donor and its matter is drained out and falls into the more massive (but more compact) star, the accretor. This releases high energy photons, for example in the X-Ray range of wavelengths. The X-Rays also come from the consumption of material on the surface of the more massive star in a process called thermonuclear burning. This can make 10 second bursts.