Massi, M.Ribó Gomis, MarcParedes i Poy, Josep MariaGarrington, S. T.Peracaula i Bosch, MartaMartí Ribas, Josep2013-08-012013-08-0120040004-6361https://hdl.handle.net/2445/45340Here we discuss two consecutive MERLIN observations of the X-ray binary LS I +61◦303. The first observation shows a double-sided jet extending up to about 200 AU on both sides of a central source. The jet shows a bent S-shaped struct ure similar to the one displayed by the well-known precessing jet of SS 433. The precession suggested in the first MERLIN image becomes evident in the second one, showing a one-sided bent jet significantly rotated with respect to the jet of the day before. We conclude that the derived precession of the relativistic (β=0.6) jet explains puzzling previous VLBI results. Moreover , the fact that the precession is fast could be the explanation of the never understood short term (days) variability of the associated gamma-ray source 2CG 135 + 01 / 3EG J0241 + 6103.4 p.application/pdfeng(c) Springer Verlag, 2004EstelsEstels binaris de raigs XRadioastronomiaRaigs gammaAstronomia de raigs gammaAstrofísicaStarsX-ray binariesRadio astronomyGamma raysGamma ray astronomyAstrophysicsinfo:eu-repo/semantics/article5116702013-08-01info:eu-repo/semantics/openAccess