The energy balance of polars revisited

Abstract

In the EXOSAT and ROSAT eras a significant number of polars were found to show a soft/hard X-ray ratio much greater than that expected from the standard accretion shock model. This was known as the ‘soft X-ray excess’. We have made an snapshot survey of polars using XMM-Newton and determined their soft/hard ratios. We find that less than one in five of… (More)

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