Runaway Massive Binaries and Cluster Ejection Scenarios

Abstract

The production of runaway massive binaries offers key insights into the evolution of close binary stars and open clusters. The stars HD 14633 and HD 15137 are rare examples of such runaway systems, and in this work we investigate the mechanism by which they were ejected from their parent open cluster, NGC 654. We discuss observational characteristics that can be used to distinguish supernova ejected systems from those ejected by dynamical interactions, and we present the results of a new radio pulsar search of these systems as well as estimates of their predicted X-ray flux assuming that each binary contains a compact object. Since neither pulsars nor X-ray emission are observed in these systems, we cannot conclude that these binaries contain compact companions. We also consider whether they may have been ejected by dynamical interactions in the dense environment where they formed, and our simulations of four-body interactions suggest that a dynamical origin is possible but unlikely. We recommend further X-ray observations that will conclusively identify whether HD 14633 or HD 15137 contain neutron stars.

Accepted to ApJ, 11 pages

References in corpus (9)

• A new calibration of stellar parameters of Galactic O stars
• SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
• The Parkes multibeam pulsar survey: VI. Discovery and timing of 142 pulsars and a Galactic population analysis
• An XMM-Newton view of the young open cluster NGC 6231 -- II. The OB star population
• N-body simulations of stars escaping from the Orion nebula
• Orbital X-Ray Variability of the Microquasar LS 5039
• A phase-resolved XMM-Newton Campaign on the Colliding Wind Binary HD 152248
• A Spectroscopic Study of Field and Runaway OB Stars
• The Massive Runaway Stars HD 14633 and HD 15137

Cited by in corpus (9)

• The imprint of a symbiotic binary progenitor on the properties of Kepler's supernova remnant
• Runaway and hypervelocity stars in the Galactic halo: Binary rejuvenation and triple disruption
• The Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4)
• The Connection Between X-ray Binaries and Star Clusters in NGC 4449
• Massive star cluster formation II. Runaway stars as fossils of sub-cluster mergers
• On the origin of very massive stars around NGC 3603
• The Mysterious Sickle Object in the Carina Nebula: A stellar wind induced bow shock grazing a clump?
• The Spatial Correlation of High Mass X-ray Binaries and Young Star Clusters in Nearby Star-Forming Galaxies
• Multiwavelength Observations of the Runaway Binary HD 15137