Radio Polarization and Astrometry Measurements of the T Tauri System

Details Radio Polarization and Astrometry Measurements of the T Tauri System Radio Polarization and Astrometry Measurements of the T Tauri System

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.4818c&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #48.18; Bulletin of the American Astronomical Society, Vol. 33, p.853

Astronomy and Astrophysics

Astronomy

Scientific paper

We present high angular resolution and high sensitivity radio observations of the T Tauri stellar system using the VLA+Pt link (a real-time fiber-optic link between the VLA and the VLBA Pt antenna, resulting in nearly a factor of two in angular resolution over the VLA's A configuration) at 8.4 and 14.9 GHz. For the first time, we unambiguously detect circularly polarized radio emission at 14.9 GHz (with angular resolution 80 milliarcseconds) from T Tau N, which has been identified with the optical star. The helicity of the circularly polarized emission from T Tau is oppositely directed from that of T Tau S, long known to be left circularly polarized. Thus the radio emission from T Tau N is clearly shown to be at least a mixture of thermal and non-thermal emission. Astrometric measurements of the relative positions of the two radio sources (T Tau N and T Tau S), taken in conjunction with previous VLA and infrared measurements, leads to interesting constraints on the orbit of the T Tau (N-S) binary system, as well as on the orbital motion of the T Tau S binary itself. The National Radio Astronomy Observatory is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc.

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