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Paper 1997021

Author(s): Frink, S., Röser, S., Neuhäuser, R., Sterzik, M.F.
Title: New proper motions of pre-main sequence stars in Taurus-Auriga
Source: Astron. Astrophys. 325, 613-622
Year: 1997
Abstract: We present proper motions of 72 T Tauri stars located in the central region of Taurus-Auriga (Tau-Aur). These proper motions are taken from a new proper motion catalogue called STARNET.
Our sample comprises 17 classical T Tauri stars (CTTS) and 55 weak-line T Tauri stars (WTTS), most of the latter discovered by ROSAT. 53 stars had no proper motion measurement before.

Kinematically, 62 of these stars are members of the association. A velocity dispersion of less than 2-3 km s^-1 is found which is dominated by the errors of the proper motions. This velocity dispersion correlates with a spread in distances.

Furthermore we present proper motions of 58 stars located in a region just south of the Taurus molecular clouds and compare the kinematics of the youngest stars in this sample (younger than 3.5·10^7 yrs) with the kinematics of the pre-main sequence stars (PMS) in the Taurus-Auriga association.
From a comparison of the space velocities we find that the stars in the central region of Tau-Aur are kinematically different from the stars in the southern part.

Among the stars with large proper motions far off the Taurus mean motion we find 2 Pleiades candidates and 7 possible Pleiades runaway stars.
Preprint issued: April 1997
Remarks: Preprint No. 71

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