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5 papers · 1 filter
The interaction of a jet-like pulse with a wind from a stellar companion
A. Riera, A. C. Raga, J. Alcolea
We present numerical simulations of the interaction between a collimated, bipolar ``pulse'' ejected from a star and a continuous wind ejected from a stellar companion. We explore t…
Applications of precision astrometry to studies of massive YSOs
M. J. Rioja, L. Moscadelli, R. Cesaroni
We present VLBI observations of the HO maser emission towards a selection of massive young stellar objects (YSOs). In one of these sources, IRAS20126+4104, the measured proper…
mm VLBA Observations of SiO masers: probing the close stellar environment of the PPN OH231.8+4.2
J. F. Desmurs, C. Sanchez Contreras, V. Bujarrabal +2
We present milliarsecond-resolution maps of the SiO maser emission v=1 J=2-1 (3 mm) in the bipolar post-AGB nebula OH231.8+4.2, and compare them with our previous observations of t…
First VLBI mapping of a rare SiO isotopic substitution
R. Soria-Ruiz, F. Colomer, J. Alcolea +3
We report the first VLBI map of the 7 mm v=0 J=1-0 maser line of the 29-SiO isotopic substitution in the long period variable star IRC+10011. We have found that this maser emission…
Circumstellar masers
J. Alcolea
Circumstellar masers are unique tools for probing the envelopes around low mass dying stars using VLBI. In this contribution I briefly review the status of our knowledge on these e…