EDP Sciences
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Volume 385, Number 3, April III 2002
Page(s) 896 - 899
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020177

A&A 385, 896-899 (2002)
DOI: 10.1051/0004-6361:20020177

Modeling the crossover variability in a differentially rotating star

V. R. Khalack1, 2

1  Main Astronomical Observatory, 27 Zabolotnogo Str., 03650 Kyiv, Ukraine
    e-mail: khalack@mao.kiev.ua
2  Isaac Newton Institute of Chile, Kiev Branch

(Received 12 October 2001 / Accepted 8 January 2002 )

Reconstruction of phase-dependent crossover effect variations is performed for a differentially rotating star assuming that point-like magnetic charges are distrubuted under the stellar surface. Models adopting the solar differential rotation law and an exponential rotation law are considered and compared to the case of a rigidly rotating star. It is shown that neglect of differential stellar rotation leads to underestimation of the equatorial rotational velocity by ~2-5%.

Key words: stars: magnetic fields -- stars: rotation -- Sun: rotation

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