Very massive runaway stars from three-body encounters

Abstract

Very massive stars preferentially reside in the cores of their parent clusters and form binary or multiple systems. We study the role of tight very massive binaries in the origin of the field population of very massive stars. We performed numerical simulations of dynamical encounters between single (massive) stars and a very massive binary with parameters similar to those of the most massive known Galactic binaries, WR 20a and NGC 3603-A1. We found that these three-body encounters could be responsible for the origin of high peculiar velocities ($\ge$ 70 km/s) observed for some very massive ($\ge$ 60-70 Msun) runaway stars in the Milky Way and the Large Magellanic Cloud (e.g., $\lambda$ Cep, BD+43 3654, Sk-67 22, BI 237, 30 Dor 016), which can hardly be explained within the framework of the binary-supernova scenario. The production of high-velocity massive stars via three-body encounters is accompanied by the recoil of the binary in the opposite direction to the ejected star. We show that the relative position of the very massive binary R145 and the runaway early B-type star Sk-69 206 on the sky is consistent with the possibility that both objects were ejected from the central cluster, R136, of the star-forming region 30 Doradus via the same dynamical event -- a three-body encounter.

10 pages, 12 figures, accepted to MNRAS

References in corpus (14)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The VLT-FLAMES Survey of Massive Stars: Observations centered on the Magellanic Cloud clusters NGC 330, NGC 346, NGC 2004, and the N11 region
• On the evolution of a star cluster and its multiple stellar systems following gas dispersal
• A Spectroscopic Survey of WNL Stars in the LMC: General Properties and Binary Status
• The very massive binary NGC3603-A1
• On the origin of field O-type stars
• A massive runaway star from 30 Doradus
• OB Stars & Stellar Bowshocks in Cygnus-X: A Novel Laboratory Estimating Stellar Mass Loss Rates
• Massive runaway stars in the Large Magellanic Cloud
• Hyperfast pulsars as the remnants of massive stars ejected from young star clusters
• A first orbital solution for the very massive 30 Dor main-sequence WN6h+O binary R145
• HD271791: dynamical versus binary-supernova ejection scenario
• BD+43 3654 -- a blue straggler?
• Separated before birth: pulsars B2020+28 and B2021+51 as the remnants of runaway stars

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• MN48: a new Galactic bona fide luminous blue variable revealed by Spitzer and SALT
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• 3D Simulations of Betelgeuse's Bow Shock
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• Discovery of two new Galactic candidate luminous blue variables with WISE
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• Gravitational Slingshot of Young Massive Stars in Orion
• High-velocity stars in the cores of globular clusters: The illustrative case of NGC 2808
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• 4U 1907+09: a HMXB running away from the Galactic plane
• Two massive stars possibly ejected from NGC 3603 via a three-body encounter
• Distances to Galactic OB-stars: Photometry vs. Parallax
• The first Infrared study of the close environment of a long Gamma-Ray Burst
• SOAR optical and near-infrared spectroscopic survey of newly discovered massive stars in the periphery of Galactic Massive star clusters I - NGC3603
• Stellar Populations in the Transition Region of Nuclear Star Cluster and Nuclear Stellar Disc
• The binary merger channel for the progenitor of the fastest rotating O-type star VFTS102
• Kinematic study of the association Cyg OB3 with Gaia DR2
• A Galactic O2 If*/WN6 star possibly ejected from its birthplace in NGC3603
• Two O2 If*/WN6 stars possibly ejected from the massive young Galactic cluster Westerlund 2
• Multiple short-lived stellar prominences on O stars: The O6.5I(n)fp star lambda Cephei
• Escape from the Bermuda cluster: orphanization by multiple stellar ejections
• HST astrometry in the 30 Doradus region: measuring proper motions of individual stars in the Large Magellanic Cloud
• Discovery of a new bona fide luminous blue variable in Norma
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• CPD-64 2731: a massive spun-up and rejuvenated high-velocity runaway star
• A spectroscopic map of the Galactic centre -- Observations and resolved stars
• Modelling O-star astrospheres with different relative speeds between the ISM and the star: 2D and 3D MHD model comparison
• Discovery of an optical cocoon tail behind the runaway HD 185806
• A systematic method to identify runaways from star clusters produced from single-binary interactions: A case study of M67
• Unveiling the Massive Stars in the Galactic Center
• Runaway stars and the Galactic supernova remnant landscape: non-thermal emission and observational evidence