Can anyone help please, MC22 is a very bright source, radiating at L=10^31W. However, no rapid periodic pulsations are apparent in the X-ray flux. It suggested that this emission arises from accretion of material from a star onto either a neutron star or black hole. From these facts can you conclusively exclude neither, one or both of these possibilities? Show how you arrived at your answer. Any help would be great, thank you Col.