Program: GN-2013B-Q-4

A Herbig-Haro bipolar jet, HH 938, has been detected on images taken in February 2005 with GMOS N of the well-known classical T Tauri star RY Tau. The new jet extends to at least 31" westward and at least 3.5' eastward. There are at least 8 visible knots in the jet with one as close as 1.5" from the star. In December 2009, direct and spectroscopic imaging was done with GMOS N to measure the motion of the knots and to determine physical data for this new jet. New images obtained in January 2012 showed a new knot in the jet (W) and large variations such that knots in the counterjet (E) could not be recognized. HH 938 is also one of a few jets detected in X-rays in Young Stellar Objects (YSOs). These new observations will show how the known knots evolve (velocity, morphology, flux) in both the jet and the counterjet. This information will help constrain jet emission mechanisms. We might also discover new knots recently ejected from the star.