mm VLBA Observations of SiO masers: probing the close stellar environment of the PPN OH231.8+4.2

(2) California Institute of Technology; C. Sanchez Contreras (2); F.Colomer (1) ((1) Observatorio Astronomico Nacional; J. Alcolea (1); J.F. Desmurs (1); Spain; USA); V. Bujarrabal (1)

arxiv: astro-ph/0412465 · v1 · submitted 2004-12-17 · 🌌 astro-ph

mm VLBA Observations of SiO masers: probing the close stellar environment of the PPN OH231.8+4.2

J.F. Desmurs (1) , C. Sanchez Contreras (2) , V. Bujarrabal (1) , J. Alcolea (1) , F.Colomer (1) ((1) Observatorio Astronomico Nacional , Spain , (2) California Institute of Technology , USA) This is my paper

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keywords observationsmasersnebulaoh231ariseaxisbipolarbright

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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 the v=2 J=1-0 line (7 mm). Our observations show that the SiO masers arise in several bright spots forming a structure elongated in a direction perpendicular to the symmetry axis of the nebula. This, and the complex velocity gradient observed, is consistent with the presence of an equatorial torus in rotation and with an infall of material towards the star.

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mm VLBA Observations of SiO masers: probing the close stellar environment of the PPN OH231.8+4.2

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