Non-thermal radiation associated with massive stars

S. DEL PALACIO; V. BOSCH-RAMON; G.E. ROMERO

Buenos Aires

Congreso; Reunion Anual de la Asociación Argentina de Astronomía; 2020

Massive stars launch powerful, supersonic winds which carry a huge kinetic power. These cangenerate strong shocks capable of accelerating relativistic particles. Such particles can emit broadband nonthermal radiation. Here we present an overview of the investigations we carried out focused on the non-thermalemission produced in systems involving massive stars (stellar bubbles, stellar bow shocks, colliding-wind binaries,and microquasars). Our main goal is to determine the cosmic-ray acceleration efficiency in these systems, theconditions upon which they can become non-thermal emitters, and the characteristics of their magnetic fields.We highlight the importance of developing broadband radiation models and their virtuous feedback with multifrequency observational campaigns comprising from radio wavelengths up to high energies (X-rays