{ "dc.contributor.author": "Massi, Maria" , "dc.contributor.author": "Ribó i Panosa, Marc" , "dc.contributor.author": "Peracaula i Bosch, Marta" , "dc.contributor.author": "Paredes i Poy, Josep Maria" , "dc.contributor.author": "Estalella i Boadella, Robert" , "dc.date.accessioned": "2010-04-30T09:39:54Z" , "dc.date.available": "2010-04-30T09:39:54Z" , "dc.date.issued": "2001" , "dc.identifier.citation": "Massi, M., Ribó, M., Paredes, J.M., Peracaula, M., i Estalella, R. (2001). One-sided jet at milliarcsecond scales in LS I +61˚303. Astronomy and Astrophysics, 376 (1), 217-223. Recuperat 30 abril de 2010, a http://dx.doi.org/10.1051/0004-6361:20010953" , "dc.identifier.issn": "0004-6361 (versió paper)" , "dc.identifier.issn": "1432-0746 (versió electrònica)" , "dc.identifier.uri": "http://hdl.handle.net/10256/2148" , "dc.description.abstract": "We present Very Long Baseline Interferometry (VLBI) observations of the high mass X-ray binary LS I +61˚303, carried out with the European VLBI Network (EVN). Over the 11 hour observing run, performed ~10 days after a radio outburst, the radio source showed a constant flux density, which allowed sensitive imaging of the emission distribution. The structure in the map shows a clear extension to the southeast. Comparing our data with previous VLBI observations we interpret the extension as a collimated radio jet as found in several other X-ray binaries. Assuming that the structure is the result of an expansion that started at the onset of the outburst, we derive an apparent expansion velocity of 0:003 c, which, in the context of Doppler boosting, corresponds to an intrinsic velocity of at least 0:4 c for an ejection close to the line of sight. From the apparent velocity in all available epochs we are able to establish variations in the ejection angle which imply a precessing accretion disk. Finally we point out that LS I +61˚303, like SS 433 and Cygnus X-1, shows evidence for an emission region almost orthogonal to the relativistic jet" , "dc.format.mimetype": "application/pdf" , "dc.language.iso": "eng" , "dc.publisher": "EDP Sciences" , "dc.relation.isformatof": "Reproducció digital del document publicat a: http://dx.doi.org/10.1051/0004-6361:20010953" , "dc.relation.ispartof": "© Astronomy and Astrophysics, 2001, vol. 376, núm. 1, p. 217-223" , "dc.relation.ispartofseries": "Articles publicats (D-ATC)" , "dc.rights": "Tots els drets reservats" , "dc.subject": "Estels" , "dc.subject": "Estels binaris de raigs X" , "dc.subject": "Stars" , "dc.subject": "X-rays double stars" , "dc.title": "One-sided jet at milliarcsecond scales in LS I +61˚ 303" , "dc.type": "info:eu-repo/semantics/article" , "dc.rights.accessRights": "info:eu-repo/semantics/openAccess" , "dc.identifier.doi": "http://dx.doi.org/10.1051/0004-6361:20010953" }