The soft X-ray properties of the polar EK UMa

We present the first extensive soft X-ray observation of the polar EK UMa (1E1048.5+5241)(1E1048.5+5241). The complete orbital light curve obtained from this ROSAT observation shows a single bright phase of width Δϕ=0.63.Δϕ=0.63. EK UMa is not detected outside this phase interval. During the bright phase a number of deep dips in the flux are seen. These dips can be caused by an additional absorption of 8×10[Superscript: 18]<ΔNH<3×10[Superscript: 20]atomcm[Superscript: −2]. The soft X-ray spectrum has an unusually high temperature of 50