Stellar Dynamics and Mass Loss in Massive Binary Systems

Massive binary systems, comprising stars each exceeding roughly eight solar masses, exhibit complex interactions that govern their evolution and end states. Strong stellar winds driven by intense radiation fields collide in a confined region shaped by the orbital motion, producing shock fronts, high‐energy emission and variable mass‐loss histories. In highly eccentric systems, close approaches at periastron can trigger enhanced mass transfer through Roche lobe overflow or intensified wind–wind collisions, leading to episodic eruptions and the formation of bipolar nebulae. The rate at which mass is lost influences angular momentum evolution, chemical enrichment of the interstellar medium and the pathways to supernovae or compact‐object mergers. Detailed studies of prototypes hosting luminous blue variables and Wolf–Rayet stars have shown how radiative forces, orbital dynamics and wind geometry combine to set the mass‐loss rate and shape the circumstellar environment, with implications for galactic ecology and gravitational‐wave progenitors.

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Stellar Dynamics and Mass Loss in Massive Binary Systems publication trend

The graph below shows the total number of articles in stellar dynamics and mass loss in massive binary systems across all publications each year (not limited to Nature Index journals).

Technical terms

Mass-loss rate: The quantity of stellar mass expelled per unit time via winds or eruptions.

Stellar wind: A continuous outflow of gas from a star’s atmosphere driven by radiation pressure or thermal processes.

Wind–wind collision zone: The region where supersonic winds from both stars interact, creating shock fronts and high-energy emission.

Roche lobe overflow: Mass transfer that occurs when a star’s outer layers extend beyond its gravitational equipotential surface and flow towards its companion.

Periastron: The point in an elliptical orbit at which two stars are at their minimum separation.

References

1. IMAGING THE TIME EVOLUTION OF ETA CARINAE'S COLLIDING WINDS WITH HST**Support for program 12013 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.. The Astrophysical Journal Letters (2011).
2. VLTI-MATISSE chromatic aperture-synthesis imaging of η Carinae’s stellar wind across the Brα line. Astronomy & Astrophysics (2021).
3. NICER X-Ray Observations of Eta Carinae during Its Most Recent Periastron Passage. The Astrophysical Journal (2022).