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Kinematics of T Tauri stars in nearby star forming regions

Frink, Sabine

German Title: Kinematik von T-Tauri-Sternen in nahen Sternentstehungsgebieten

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The kinematics of T Tauri stars in the nearby star forming regions Taurus-Auriga, Chamaeleon, Lupus and Scorpius-Centaurus is studied using proper motions from the Hipparcos, PPM, ACT, TRC and STARNET proper motion catalogues. Especially the STARNET catalogue is very well suited for this purpose as it provides accurate proper motions for about 4.3 million stars, so that a large number of T Tauri stars is included in that catalogue. Where available, Hipparcos parallaxes and radial velocities are combined with the proper motions to calculate space velocities and velocity dispersions. In the Scorpius-Centaurus association, the favourable geometry allows for the determination of kinematical distances. A large fraction of the stars in the samples belongs to the population of weak-line T Tauri stars discovered with the help of the X-ray satellite ROSAT during the last years. In contrast to classical T Tauri stars, which had preferentially been found very close to the densest cores of the cloud material in those star forming regions, weak-line T Tauri stars are distributed over larger regions in space. The kinematic signatures of processes producing such halos of weak-line T Tauri stars should still be visible, and the observed motions of the stars are analyzed in the framework of various star formation scenarios.

Document type: Dissertation
Supervisor: Fuchs, Professor Burkhard
Date of thesis defense: 10 February 1999
Date Deposited: 10 Oct 2000 00:00
Date: 1999
Faculties / Institutes: Service facilities > Zentrum für Astronomie der Universität Heidelberg (ZAH) > ZAH: Astronomisches Rechen-Institut
DDC-classification: 530 Physics
Controlled Keywords: T-Tauri-Stern, Sternentstehung, Sternentstehungsgebiet, Kinematik, Eigenbewegung <Astronomie>
Uncontrolled Keywords: T Tauri stars , star formation , star forming regions , kinematics , proper motions (astronomy)
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