Magnetically Active Stars in Taurus-Auriga: Activity and Rotation

Abstract

A sample of 70 magnetically active stars toward the Taurus-Auriga star-forming region has been investigated. The positions of the sample stars on the Rossby diagram have been analyzed. All stars are shown to be in the regime of a saturated dynamo, where the X-ray luminosity reaches its maximum and does not depend on the Rossby number. A correlation has been found between the lithium line equivalent width and the age of a solar-mass (from 0.7 to 1.2 Msun) pre-main-sequence star. The older the age, the smaller the Li line equivalent width. Analysis of the long-term photometric variability of these stars has shown that the photometric activity of the youngest stars is appreciably higher than that of the older objects from the sample. This result can be an indirect confirmation of the evolution of the magnetic field in pre-main-sequence stars from predominantly dipole and axisymmetric to multipole and nonaxisymmetric.

16 pages with 8 Postscript figures

References in corpus (6)

• Magnetospheric accretion and spin-down of the prototypical classical T Tauri star AATau
• Results of the ROTOR-program. II. The long-term photometric variability of weak-line T Tauri stars
• Non-stationary dynamo & magnetospheric accretion processes of the classical T Tauri star V2129 Oph
• Rotation and activity of pre-main-sequence stars
• Magnetically Active Stars in Taurus-Auriga: Photometric Variability and Basic Physical Parameters
• Magnetically Active Stars in Taurus-Auriga: Evolutionary Status

Cited by in corpus (2)

• T Tauri Stars: Physical Parameters and Evolutionary Status
• Photometric observations of NGC 281: Detection of 228 variable stars