Reverse Algols and hydrogen-rich Wolf-Rayet stars from very massive binaries

Abstract

Massive star feedback affects the evolution of galaxies, where the most massive stars may have the largest impact. The majority of massive stars are born as members of close binary systems. Here, we investigate detailed evolutionary models of very massive binaries (30$\dots$90$M_{\odot }$) with Large Magellanic Cloud (LMC) metallicity. We identify four effects defying the conventional knowledge of binary evolution, which are all related to the proximity of the models to the Eddington limit. We find that the majority of systems undergo mass transfer during core hydrogen burning. During the ensuing nuclear timescale evolution, many mass donors remain more massive than their companions (``reverse Algols''), and nuclear timescale mass transfer may be interrupted or absent altogether. Furthermore, due to the elevated luminosity-to-mass ratio, many of the core-hydrogen burning donors may develop Wolf-Rayet-type winds, at luminosities where single stars would not. We identify observational counterparts of very massive reverse Algol binaries in the LMC, and discuss their contribution to the observed hydrogen-rich Wolf-Rayet stars. We argue that an understanding of very massive Algol systems is key to predicting the advanced evolution of very massive binaries, including their ability to evolve into observable gravitational wave sources.

15 pages, 5 figures, proposed for acceptance in A&A. Animation at https://zenodo.org/record/4068428#.Y-SrOtLMKV4

References in corpus (46)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Binary interaction dominates the evolution of massive stars
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• Origin of the heavy elements in binary neutron-star mergers from a gravitational wave event
• Pre-Supernova Evolution of Massive Single and Binary Stars
• Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
• Mass loss from hot massive stars
• Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection
• The effect of massive binaries on stellar populations and supernova progenitors
• The empirical metallicity dependence of the mass-loss rate of O- and early B-type stars
• Cygnus X-1 contains a 21-solar mass black hole -- implications for massive star winds
• An excess of massive stars in the local 30 Doradus starburst
• Mass loss from late-type WN stars and its Z-dependence: very massive stars approaching the Eddington limit
• Current Status of r-Process Nucleosynthesis
• Double neutron stars: merger rates revisited
• The VLT-FLAMES survey of massive stars: atmospheric parameters and rotational velocity distributions for B-type stars in the Magellanic Clouds
• Efficiency of mass transfer in massive close binaries, Tests from double-lined eclipsing binaries in the SMC
• The impact of companions on stellar evolution
• The evolution of rotating very massive stars with LMC composition
• The spectroscopic Hertzsprung-Russell diagram
• The VLT-FLAMES Tarantula Survey XVII. Physical and wind properties of massive stars at the top of the main sequence
• The Tarantula Massive Binary Monitoring: I. Observational campaign and OB-type spectroscopic binaries
• The spectroscopic Hertzsprung-Russell diagram of Galactic massive stars
• Constraining mixing in massive stars in the Small Magellanic Cloud
• Towards a better understanding of the evolution of Wolf-Rayet stars and Type Ib/Ic supernova progenitors
• Gamma-Ray Bursts from tidally spun-up Wolf-Rayet stars?
• Why binary interaction does not necessarily dominate the formation of Wolf-Rayet stars at low metallicity
• Metallicity-dependent wind parameter predictions for OB stars
• Binary black hole mergers: formation and populations
• Massive donors in interacting binaries: effect of metallicity
• Detailed models of interacting short-period massive binary stars
• The dependence of convective core overshooting on stellar mass: reality check, and additional evidence
• The metallicity dependence of envelope inflation in massive stars
• Stellar mergers as the origin of the blue main-sequence band in young star clusters
• Effects of close binary evolution on the main-sequence morphology of young star clusters
• The Tarantula Massive Binary Monitoring: III. Atmosphere analysis of double-lined spectroscopic systems
• Explosion and nucleosynthesis of low redshift pair instability supernovae
• The Tarantula Massive Binary Monitoring. IV. Double-lined photometric binaries
• The excess of cool supergiants from contemporary stellar evolution models defies the metallicity-independent Humphreys-Davidson limit
• Weighing Melnick 34: the most massive binary system known
• A synthetic population of Wolf-Rayet stars in the LMC based on detailed single and binary star evolution models
• Massive Stellar Mergers as Precursors of Hydrogen-rich Pulsational Pair Instability Supernovae
• X-ray emission from BH+O star binaries expected to descend from the observed galactic WR+O binaries
• Stripped-Envelope Stars in Different Metallicity Environments I. Evolutionary Phases, Classification and Populations
• Wind properties of Milky Way and SMC massive stars: empirical Z dependence from CMFGEN models
• A comparison between observed Algol-type double stars in the Solar neighborhood and evolutionary computations of galactic case A binaries with a B-type primary at birth