Submilliarcsecond-resolution mapping of the 43 GHz SiO maser emission in the bipolar post-AGB nebula OH231.8+4.2

Details Submilliarcsecond-resolution mapping of the 43 GHz SiO maser emission in the bipolar post-AGB nebula OH231.8+4.2 Submilliarcsecond-resolution mapping of the 43 GHz SiO maser emission in the bipolar post-AGB nebula OH231.8+4.2

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...385l...1s&link_type=abstract

Astronomy and Astrophysics, v.385, p.L1-L4 (2002)

Astronomy and Astrophysics

Astrophysics

26

Masers, Stars: Agb And Post-Agb, Stars: Mass-Loss, Circumstellar Matter, Stars: Individual: Oh231.8+4.2, Stars: Variables: General

Scientific paper

We present ~ 0.3 milliarcsec-resolution maps of the SiO (v=2, J=1-0) maser emission in the bipolar post-AGB nebula OH231.8+4.2 obtained with the Very Long Baseline Array. These observations have provided for the first time the structure and kinematics of the close stellar environment in a proto-Planetary Nebula. Our observations reveal the SiO maser emission arising in several bright spots of less than ~ 1013 cm in size forming a structure elongated in the direction perpendicular to the symmetry axis of the nebula. Such a distribution is consistent with an equatorial torus with a radius of ~ 6 AU around the central star. A complex velocity gradient is found along the torus, which suggests rotation and infall of material towards the star. The rotation and infalling velocities deduced are of the same order and range between ~ 7 and ~ 10 km s-1. From our data, we estimate the mass of the SiO torus and the central star, as well as a stringent upper limit to the present stellar mass-loss rate. Based on observations with the Very Large Baseline Array of the The National Radio Astronomy Observatory (NRAO). NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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