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GRAVITY chromatic imaging of η Car’s core - Milliarcsecond resolution imaging of the wind-wind collision zone (Brγ, He I)
Context . η Car is one of the most intriguing luminous blue variables in the Galaxy. Observations and models of the X-ray, ultraviolet, optical, and infrared emission suggest a central binary in a highly eccentric orbit with a 5.54 yr period residing in its core. 2D and 3D radiative transfer …