Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1K076

Orbital Motion in Pre-Main Sequence Binaries

Schaefer, Gail (The CHARA Array of Georgia State University)
Prato, Lisa (Lowell Observatory)
Simon, Michal (Stony Brook University)
Patience, Jenny (Arizona State University; University of Exeter)

We present results from our ongoing program to map the visual orbits of pre-main sequence binaries in the Taurus star forming region using adaptive optics imaging at the Keck Observatory. Our goal is to measure precise masses of low-mass pre-main sequence stars to compare with models of stellar evolution. Thus far, we have computed definitive orbits for V807 Tau Ba-Bb and NTTS 045251+3016 and preliminary solutions for DF Tau, T Tau Sa-Sb, and ZZ Tau. Seven additional systems show curvature in their relative motion; currently we can place lower limits on their orbital periods. Full solutions will be possible as we obtain more coverage of their orbits. Five systems show motion that is indistinguishable from linear motion. Continued observations will confirm whether these systems are bound.

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