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Most previous high-angular (<0.1 arcsec) resolution studies of molecularmasers in high-mass star forming regions (SFRs) have concentrated mainly oneither water or methanol masers. While high-angular resolution observationshave clarified that water masers originate from shocks associated withprotostellar jets, different environments have been proposed in several sourcesto explain the origin of methanol masers. Tha aim of the paper is toinvestigate the nature of the methanol maser birthplace in SFRs and theassociation between the water and methanol maser emission in the same youngstellar object. We have conducted phase-reference Very Long BaselineInterferometry (VLBI) observations of water and methanol masers toward twohigh-mass SFRs, Sh 2-255 IR and AFGL 5142. In Sh 2-255 IR water masers arealigned along a direction close to the orientation of the molecular outflowobserved on angular scales of 1-10 arcsec, tracing possibly the disk-windemerging from the disk atmosphere. In AFGL 5142 water masers trace expansion atthe base of a protostellar jet, whilst methanol masers are more probablytracing infalling than outflowing gas. The results for AFGL 5142 suggest thatwater and methanol masers trace different kinematic structures in thecircumstellar gas.Comment: 11 pages, 3 figures, accepted for publication in Astronomy &  Astrophysic

Associations of H2O and CH3OH masers at milli-arcsec angular resolution in two high-mass YSOs

Associations of H₂O and CH₃OH masers at milli-arcsec angular resolution in two high-mass YSOs