[156.03] A 2\% Parallax for T Tauri South from the VLBA

AAS 205th Meeting, 9-13 January 2005
Session 156 T Tauri Stars and Their Disks
Oral, Thursday, January 13, 2005, 10:00-11:30am, California

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[156.03] A 2% Parallax for T Tauri South from the VLBA

A.J. Mioduszewski (NRAO), L. Lionard, L.F. Rodriguez, R.A. Gonzalez, M.I. Rodriguez, R.M. Torres (UNAM CRyA)

We present multi-epoch Very Long Baseline Array (VLBA) observations of the non-thermal radio source associated with T Tauri South. These observations show a compact source which is most likely associated with the magnetosphere of the underlying pre-main sequence star. We obtain absolute astrometry with the VLBA to an error of 0.25 mas, which allows a very precise measurement of the trigonometric parallax and proper motion of T Tauri South. The trigonometric parallax is \pi=7.07 ±0.14 mas, corresponding to a distance of 141.52^+2.81 _-2.81 pc. There is some indication that the compact radio source in T Tauri South is slightly resolved, with an faint extension which may arise from from reconnection flares at the star-disk surface.

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