Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-28
Astronomy and Astrophysics
Astrophysics
To appear in the proceedings of IAU Symposium #206: Cosmic Masers (Mangaratiba, Brazil; March 2001); 4 pages; Uses newpasp.sty
Scientific paper
We performed the first VLBI observations of the SiO v=1 and v=2 J=1--0 masers in a Proto Planetary Nebula OH 231.8+4.2 (also known as the Rotten Egg nebula), at milliarcsecond resolution. Only the v=2 maser transition was detected. We detect several maser spots lying along a line which is almost perpendicular to the axis of symmetry of the Nebula. We find that all the emission is concentrated in an area of ~10 mas, indicating that the SiO masers are originated very close to the surface of the star. One of the two emission areas presents an elongated structure with a clear velocity gradient. The detected emission is consistent with a torus, or disk, in rotation with a velocity of ~6 km/s and with an infall velocity of ~10 km/s.
Alcolea Javier
Bujarrabal Valentin
Colomer Francisco
Contreras S'anchez C.
Desmurs J.-F.
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