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LS I +61 303 has been recently detected as a periodic gamma-ray source by theMajor Atmospheric Imaging Cerenkov (MAGIC) telescope. A distinctive orbitalcorrelation of the $\gamma$-ray emission was found. This work shows that therange of uncertainties yet at hand in the orbital elements of the binary systemLSI as well as in the possible assumptions on the stellar wind of the opticalcompanion play a non-negligible role in the computation of opacities to highenergy processes leading to $\gamma$-ray predictions. The geometry influence onthe propagation and escape of $\gamma$-ray photons is explored. With this studyat hand, we analyse the results of a pulsar wind zone model for the productionof gamma-rays and compare it with recent MAGIC observations.

gamma-ray emission from LS I +61 303: The impact of basic system uncertainties