Anti-solar differential rotation and surface flow pattern on UZ Librae

Abstract

We re-investigate UZ Librae spectra obtained at KPNO in 1998 and 2000. From the 1998 data we compose 11 consecutive Doppler images using the Ca I-6439, Fe I-6393 and Fe I-6411 lines. Applying the method of average cross-correlation of contiguous Doppler images we find anti-solar differential rotation with a surface shear of alpha ~ -0.03. The pilot application of the local correlation tracking technique for the same data qualitatively confirms this result and indicates complex flow pattern on the stellar surface. From the cross-correlation of the two available Doppler images in 2000 we also get anti-solar differential rotation but with a much weaker shear of alpha ~ -0.004.

3 pages, 3 figures, submitted to AN

References in corpus (2)

• Large-scale horizontal flows in the solar photosphere I: Method and tests on synthetic data
• Large-scale horizontal flows in the solar photosphere III: Effects on filament destabilization

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