AAS 203rd Meeting, January 2004
Session 5 T Tauri Stars
Poster, Monday, January 5, 2004, 9:20am-6:30pm, Grand Hall

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[5.04] The Enigmatic Radio Source T Tau S

K. J. Johnston, A. L. Fey, R. A. Gaume, C. A. Hummel (U.S. Naval Observatory), S. Garrington, T. Muxlow, P. Thomasson (University of Manchester Jodrell Bank Observatory)

We have observed the T Tau multiple star system using the Multi Element Radio Linked Interferometer Network at a frequency of 5 GHz. The centimeter wavelength radio emission from T Tau S has been found to consist of at least two components separated by approximately 70 mas in right ascension at Julian Epoch 2001.89. The observations are consistent with the most intense unresolved emission being associated with an M type star in the T Tau S binary system. Using our new data and that previously published we have fitted an improved orbit for the T Tau S binary system. The orbital elements are estimated as follows: semi major axis is 88 mas, eccentricity 0.59, inclination 32 degrees, periastron 117 degrees, ascending node 257 degrees, period 11515 days, and epoch 2450064. The masses of the stars are 3.2 solar masses for Sa and 0.7 solar masses for Sb respectively. This is consistent with T Tau Sa being a pre main sequence star.

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.