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Astron. Astrophys. 325, 613-622 (1997)

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New proper motions of pre-main sequence stars in Taurus-Auriga

S. Frink 1, S. Röser 1, R. Neuhäuser 2 and M.F. Sterzik 2

1 Astronomisches Rechen-Institut Heidelberg, Mönchhofstraße 12-14, D-69120 Heidelberg, Germany
2 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, Germany

Received 3 March 1997 / Accepted 8 April 1997


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 [FORMULA] 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.

Key words: stars: kinematics – stars: formation – stars: pre-main sequence – stars: late-type – astrometry

Send offprint requests to: S. Frink, e-mail: sabine@relay.ari.uni-heidelberg.de

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998