Summary: Astronomy & Astrophysics manuscript no. accretion c ESO 2006
December 1, 2006
X-ray Emission from T Tauri Stars and the Role of Accretion:
Inferences from the XMM-Newton Extended Survey of the Taurus
Alessandra Telleschi1, Manuel G¨udel1, Kevin R. Briggs1, Marc Audard2 and Francesco Palla3
Paul Scherrer Institut, W¨urenlingen and Villigen, CH-5232 Villigen PSI, Switzerland
Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, Mail code 5247, New York, NY 10027, USA,
INAF-Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi, 5, I-50125 Firenze, Italy
Recived 2006; accepted 2006
Context. T Tau stars display different X-ray properties depending on whether they are accreting (classical T Tau stars; CTTS) or not (weak-line
T Tau stars; WTTS). X-ray properties may provide insight into the accretion process between disk and stellar surface.
Aims. We use data from the XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) to study differences in X-ray properties
between CTTS and WTTS.
Methods. XEST data are used to perform correlation and regression analysis between X-ray parameters and stellar properties.
Results. We confirm the existence of a X-ray luminosity (LX) vs. mass (M) relation, LX M1.69±0.11