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Discovery of an Eclipsing X‐Ray Binary with a 32.69 hr Period in M101: An Analog of Her X‐1 or LMC X‐4?
We report the discovery of an eclipsing X-ray binary in M101, the first such system to be discovered outside the Local Group. Based on a sequence of 25 Chandra observations that sample a wide range of orbital phases, we find a period of 32.688 $\pm$ 0.002 hours, which we interpret …