Journal Article

Analysis of <i>MOST</i> light curves of five young stars in Taurus–Auriga and Lupus 3 star-forming regions*

Michal Siwak, Slavek M. Rucinski, Jaymie M. Matthews, Rainer Kuschnig, David B. Guenther, Anthony F. J. Moffat, Dimitar Sasselov and Werner W. Weiss

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 2, pages 1119-1124
Published in print August 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI:
Analysis of MOST light curves of five young stars in Taurus–Auriga and Lupus 3 star-forming regions*

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Continuous photometric observations of five young stars obtained by the MOST satellite in 2009 and 2010 in the Taurus and Lupus star formation regions are presented. Using light-curve modelling under the assumption of internal invariability of spots, we obtained small values of the solar-type differential-rotation parameter (k = 0.0005–0.009) for three spotted weak-line T Tauri stars, V410 Tau, V987 Tau and Lupus 3-14; for another spotted weak-line T Tauri star (WTTS), Lupus 3-48, the data are consistent with a rigidly rotating surface (k = 0). Three flares of similar rise (4 min and 30 s) and decay (1 h and 45 min) times were detected in the light curve of Lupus 3-14. The brightness of the classical T Tauri star RY Tau continuously decreased over 3 weeks of its observations with a variable modulation not showing any obvious periodic signal.

Keywords: stars: individual: RY Tau; stars: individual: V410 Tau; stars: individual: V987 Tau; stars: individual: Lupus 3-14; stars: individual: Lupus 3-48; stars: rotation

Journal Article.  4254 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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