NEW PROPER MOTIONS OF PRE-MAIN-SEQUENCE STARS IN TAURUS-AURIGA

Citation
S. Frink et al., NEW PROPER MOTIONS OF PRE-MAIN-SEQUENCE STARS IN TAURUS-AURIGA, Astronomy and astrophysics, 325(2), 1997, pp. 613-622
Citations number
23
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
00046361
Volume
325
Issue
2
Year of publication
1997
Pages
613 - 622
Database
ISI
SICI code
0004-6361(1997)325:2<613:NPMOPS>2.0.ZU;2-Y
Abstract
We present proper motions of 72 T Tauri stars located in the central r egion 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 th e association. A velocity dispersion of less than 2-3 km s(-1) is foun d which is dominated by the errors of the proper motions. This velocit y dispersion correlates with a spread in distances. Furthermore we pre sent proper motions of 58 stars located in a region just south of the Taurus molecular clouds and compare the kinematics of the youngest sta rs 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. Fr om a comparison of the space velocities we find that the stars in the central region of Tau-Aur are kinematically different from the stars i n the southern part. Among the stars with large proper motions far off the Taurus mean motion we find 2 Pleiades candidates and 7 possible P leiades runaway stars.