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Rotation effects in classical T Tauri stars

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Abstract

Surface temperature inhomogeneities in classical T Tauri stars (CTTS) induced by magnetic activity andmass accretion lead to rotationalmodulation of both photometric and spectroscopic parameters of these stars. Using the extended photometric catalogue byGrankin et al., 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 0.3−3M ⊙ 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.

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Authors and Affiliations

  1. Crimean Astrophysical Observatory, pos. Nauchnyi, Crimea, 98409, Ukraine

    S. A. Artemenko, K. N. Grankin & P. P. Petrov

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  1. S. A. Artemenko
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  2. K. N. Grankin
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  3. P. P. Petrov
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Correspondence to P. P. Petrov.

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Original Russian Text © S.A. Artemenko, K.N. Grankin, P.P. Petrov, 2012, published in Pis’ma v Astronomicheskiı Zhurnal, 2012, Vol. 38, No. 12, pp. 872–882.

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Artemenko, S.A., Grankin, K.N. & Petrov, P.P. Rotation effects in classical T Tauri stars. Astron. Lett. 38, 783–792 (2012). https://doi.org/10.1134/S1063773712110011

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