XMM-Newton observations of AM CVn binaries

Contains fulltext : 33048.pdf ( ) (Open Access) Contains fulltext : 33048.pdf (publisher's version ) (Open Access)We present the results of XMM-Newton observations of four AM CVn systems - AM CVn, CR Boo, HP Lib and GP Com. Their light curves show very different characteristics. The X-ray light curves show no coherent pulsations, suggesting the accreting white dwarfs have relatively low magnetic field strengths. Their spectra were best modelled using a multi-temperature emission model and a strong UV component. We find tha