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Detection of an inner torus in the protoplanetary nebulae OH231.8+4.2

Published online by Cambridge University Press:  03 August 2017

Jean-François Desmurs ,
C. Sánchez Contreras ,
Valentín Bujarrabal ,
Francisco Colomer  and
Javier Alcolea
Jean-François Desmurs
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain
C. Sánchez Contreras
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain
Valentín Bujarrabal
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain
Francisco Colomer
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain
Javier Alcolea
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain

Abstract

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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.

Type
Part 3. Protoplanetary Nebulae
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 344 - 347
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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