2003/09/08 by J. F. Desmurs, J. -F. Desmurs, C. Sánchez Contreras +9
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #Astrophysics and Star Formation Studies #FOS: Physical sciences #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0309222
3 pages, 1 figure; to appear in the PASP conference proceeding of the VLBA 10th Anniversary Meeting
arxiv created 2003/09/08 · openalex publication_date 2003/09/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present milliarsecond-resolution maps of the SiO maser emission v=1 J=2--1 (3 mm) in the bipolar post-AGB nebula OH 231.8+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.