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HD 15137 is an intriguing runaway O-type binary system that offers a rareopportunity to explore the mechanism by which it was ejected from the opencluster of its birth. Here we present recent blue optical spectra of HD 15137and derive a new orbital solution for the spectroscopic binary and physicalparameters of the O star primary. We also present the first XMM-Newtonobservations of the system. Fits of the EPIC spectra indicate soft, thermalX-ray emission consistent with an isolated O star. Upper limits on theundetected hard X-ray emission place limits on the emission from a proposedcompact companion in the system, and we rule out a quiescent neutron star inthe propellor regime or a weakly accreting neutron star. An unevolved secondarycompanion is also not detected in our optical spectra of the binary, and it isdifficult to conclude that a gravitational interaction could have ejected thisrunaway binary with a low mass optical star. HD 15137 may contain an elusiveneutron star in the ejector regime or a quiescent black hole with conditionsunfavorable for accretion at the time of our observations.

Multiwavelength Observations of the Runaway Binary HD 15137