Goddi, C.C.GoddiMOSCADELLI, LucaLucaMOSCADELLISANNA, ALBERTOALBERTOSANNACESARONI, RiccardoRiccardoCESARONIMinier, V.V.Minier2022-12-272022-12-272007978-0521-87464-91743-9213http://hdl.handle.net/20.500.12386/32804We have conducted phase-reference VLBI observations of H<SUB>2</SUB>O and CH<SUB>3</SUB>OH masers toward two high-mass star forming regions, Sh 2-255 IR and AFGL 5142. In Sh 2-255 infrared water masers are aligned along a direction close to the orientation of a large scale H<SUB>2</SUB> jet, tracing possibly shocked material in a precessing jet, or, alternatively, the disk-wind emerging from the disk atmosphere. In AFGL 5142 water masers trace expansion at the base of a protostellar jet, whilst methanol masers are more probably tracing infalling than outflowing gas. Our results suggest that water and methanol masers trace different kinematic structures in the circumstellar gas.ELETTRONICOenConference paper10.1017/S17439213070127682-s2.0-38849095785https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/vlbi-observations-of-h2o-and-ch3oh-masers-in-two-highmass-ysos/1642143F650162F3ADE896762F4A8450https://api.elsevier.com/content/abstract/scopus_id/388490957852007IAUS..242..152GFIS/05 - ASTRONOMIA E ASTROFISICA