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The stellar binary $\eta$ Carinae has been observed during its full orbitalperiod in gamma rays by the Fermi-Large Area Telescope (LAT). Theshock-accelerated electrons in the colliding winds of the two stars radiatesynchrotron photons in the magnetic field of the shocked region and inverseCompton photons, where the target photons are from the thermal emissions by themore massive and luminous of the two stars. The inverse Compton emissiondominates the gamma-ray flux data from the $\eta$ Carinae, however the spectralenergy distribution shows signature of a hadronic component in the $\sim10$-300 GeV range during the periastron passage. Current and future airCherenkov telescopes will be able to constrain this component at TeV energies.Acceleration of cosmic-ray protons to $\gg 1$ TeV energies in the collidingwinds, required to explain the hadronic emission component through photopioninteractions, can lead to detectable signal of $\gtrsim 10$ TeV neutrino eventsin large kilometer scale neutrino telescopes.

A lepto-hadronic model of gamma rays from the Eta Carinae and prospects for neutrino telescopes