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The nature of the methanol maser ring G23.657-00.127
A. Bartkiewicz, A. Brunthaler, M. Szymczak +2
Methanol masers are associated with young high-mass stars and are an important tool for investigating the process of massive star formation. The recently discovered methanol maser…
EVN observations of an OH maser burst in OH17.7-2.0
M. Szymczak, A. Bartkiewicz, E. Gerard
We have observed the OH 1612-MHz maser emission towards the proto-planetary nebula candidate OH17.7-2.0 that underwent a very strong and unusual outburst in 2003. Phase-referencing…
A multi-transition molecular line study of candidate massive young stellar objects associated with methanol masers
M. Szymczak, A. Bartkiewicz, A. M. S. Richards
We characterize the molecular environment of candidate massive young stellar objects (MYSOs) signposted by methanol masers. Single pixel observations of 10 transitions of HCO^+, CO…
Oxygen-rich disk in the V778 Cyg system resolved
R. Szczerba, M. Szymczak, N. Babkovskaia +3
Various scenarios have been proposed to explain the presence of silicate features associated with carbon stars, such as V778 Cyg. We have attempted to constrain these theories by m…
Hidden bipolarity in red supergiant winds
A. M. S. Richards, M. R. W. Masheder, H. J. van Langevelde +7
Many observations of late-type M stars show large near-spherical circumstellar envelopes, yet planetary nebulae and supernova remnants are frequently axisymmetric. We present VLBI…
Methanol masers in environments of three massive protostars
A. Bartkiewicz, M. Szymczak, H. J. van Langevelde
We present the first EVN maps of 6.7 GHz methanol masers of three high-mass protostar candidates selected from the Torun unbiased survey of the Galactic plane. A variety of linear…