Rotation Effects in Classical T Tauri Stars

Abstract

Surface temperature inhomogeneities in classical T Tauri stars (CTTS) induced by magnetic activity and mass accretion lead to rotational modulation of both photometric and spectroscopic parameters of these stars. Using the extended photometric catalogue by Grankin et al. (2007), we have derived the periods and amplitudes of the rotational modulation of brightness and color for 31 CTTS; for six of them, the periods have been revealed for the first time. The inclinations of the rotation axis and equatorial rotational velocities of CTTS have been determined. We show that the known periods of brightness variations for some of the CTTS are not the axial rotation periods but are the Keplerian periods near the inner boundary of the dusty disk. We have found that the angular velocity of CTTS with a mass of 0.3 - 3 M_sun in the Taurus-Auriga complex remains constant in the age range 1 - 10 Myr. CTTS on radiative evolutionary tracks rotate faster than completely convective CTTS. The specific angular momentum of CTTS depends on the absolute luminosity in the Hα- line.

arXiv comment12 pages, 4 figures

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• CSI 2264: Investigating rotation and its connection with disk accretion in the young open cluster NGC 2264
• Rotation of Low-Mass Stars in Taurus with K2
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• Misalignment of the outer disk of DK Tau and a first look at its magnetic field using spectropolarimetry
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• Density streams in the disc winds of Classical T Tauri stars
• Results of magnetic field measurements in young stars DO Tau, DR Tau, DS Tau