The multiplicity of massive stars

Abstract

Binaries are excellent astrophysical laboratories that provide us with direct measurements of fundamental stellar parameters. Compared to single isolated star, multiplicity induces new processes, offering the opportunity to confront our understanding of a broad range of physics under the extreme conditions found in, and close to, astrophysical objects. In this contribution, we will discuss the parameter space occupied by massive binaries, and the observational means to investigate it. We will review the multiplicity fraction of OB stars within each regime, and in different astrophysical environments. In particular we will compare the O star spectroscopic binary fraction in nearby open clusters and we will show that the current data are adequately described by an homogeneous fraction of f~0.44. We will also summarize our current understanding of the observed parameter distributions of O+OB spectroscopic binaries. We will show that the period distribution is overabundant in short period binaries and that it can be described by a bi-modal Oepik law with a break point around P~10d. The distribution of the mass-ratios shows no indication for a twin population of equal mass binaries and seems rather uniform in the range 0.2< q=M_2/M_1<1.0.

12 pages, 4 figures, IAU272: Active OB stars: structure, evolution, mass loss

References in corpus (10)

• Young massive star clusters
• The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 Msun stellar mass limit
• The High Angular Resolution Multiplicity of Massive Stars
• The effect of massive binaries on stellar populations and supernova progenitors
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• The prototype colliding-wind pinwheel WR 104
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• Rotation and massive close binary evolution
• Numerical heat conduction in hydrodynamical models of colliding hypersonic flows
• The evolution of massive and very massive stars in clusters

Cited by in corpus (41)

• The VLT-FLAMES Tarantula Survey VIII. Multiplicity properties of the O-type star population
• Stellar-mass black holes in young massive and open stellar clusters and their role in gravitational-wave generation
• The VLT-FLAMES Tarantula Survey XXII. Multiplicity properties of the B-type stars
• Properties of Galactic early-type O-supergiants: A combined FUV-UV and optical analysis
• The Tarantula Massive Binary Monitoring: I. Observational campaign and OB-type spectroscopic binaries
• Catalogue of particle-accelerating colliding-wind binaries
• The VLT-FLAMES Tarantula Survey. VII. A low velocity dispersion for the young massive cluster R136
• Search for associations containing young stars (SACY). V. Is multiplicity universal? Tight multiple systems
• Preparing the next gravitational million-body simulations: Evolution of single and binary stars in Nbody6++GPU, MOCCA and McLuster
• The young massive SMC cluster NGC 330 seen by MUSE. I. Observations and stellar content
• Evidence for a physically bound third component in HD 150136
• A spectroscopic investigation of the O-type star population in four Cygnus OB associations. I. Determination of the binary fraction
• The IMF and multiplicity of stars from gravity, turbulence, magnetic fields, radiation and outflow feedback
• Clues on the Origin and Evolution of Massive Contact Binaries: Atmosphere Analysis of VFTS 352
• The impact of stellar evolution on rotating star clusters: the gravothermal-gravogyro catastrophe and the formation of a bar of black holes
• Implementing Primordial Binaries in Simulations of Star Cluster Formation with a Hybrid MHD and Direct N-Body Method
• The Close Binary Fraction of Dwarf M Stars
• New massive members of Cygnus OB2
• The BinaMIcS project: understanding the origin of magnetic fields in massive stars through close binary systems
• Stellar-mass black holes in young massive and open stellar clusters V: comparisons with LIGO-Virgo merger rate densities
• Dynamics of binary black holes in young star clusters: the impact of cluster mass and long-term evolution
• The multiplicity of massive stars: a 2016 view
• Demographics of neutron stars in young massive and open clusters
• Supernova Kicks and Dynamics of Compact Remnants in the Galactic Centre
• Mass transfer and tidally tilted pulsation in the Algol-type system TZ Dra
• A VLT/FLAMES survey for massive binaries in Westerlund 1: VIII. Binary Systems and Orbital Parameters
• Binary-corrected velocity dispersions from single- and multi-epoch radial velocities: massive stars in R136 as a test case
• Binary black hole mergers from young massive and open clusters: comparison to GWTC-2 gravitational wave data
• Episodic accretion and mergers during growth of massive protostars
• Direct Detection of the Tertiary Component in the Massive Multiple HD 150 136 with VLTI
• The new Wolf-Rayet binary system WR62a
• The spin rates of O stars in WR + O Magellanic Cloud binaries
• The influence of the cloud virial parameter on the initial mass function
• A clustered origin for isolated massive stars
• Discovery of an M-type Companion to the Herbig Ae Star V1787 Ori
• A Deep Chandra Observation of the Giant HII Region N11 I. X-ray Sources in the Field
• Fundamental parameters of the massive eclipsing binary HM1 8
• The outer orbit of the high-mass stellar triple system Herschel 36 determined with the VLTI
• Stellar Multiplicity in Open Clusters: Investigating Binary Fractions and Their Relationship with Cluster Properties
• Radio observations of massive stars in the Galactic centre: The Quintuplet cluster
• Multiwavelength view of massive binaries