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

K. Vida, Z. Kővári, M. Švanda, K. Oláh, K. G. Strassmeier, J. Bartus

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We re-investigate UZ Libræ 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 α ≈ -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 α ≈ -0.004.

Original languageEnglish
Pages (from-to)1078-1080
Number of pages3
JournalAstronomische Nachrichten
Volume328
Issue number10
DOIs
Publication statusPublished - Oct 2007

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flow pattern
flow distribution
cross correlation
shear
method

Keywords

  • Stars: activity
  • Stars: imaging
  • Starspots

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Anti-solar differential rotation and surface flow pattern on UZ Libræ. / Vida, K.; Kővári, Z.; Švanda, M.; Oláh, K.; Strassmeier, K. G.; Bartus, J.

In: Astronomische Nachrichten, Vol. 328, No. 10, 10.2007, p. 1078-1080.

Research output: Contribution to journalArticle

Vida, K. ; Kővári, Z. ; Švanda, M. ; Oláh, K. ; Strassmeier, K. G. ; Bartus, J. / Anti-solar differential rotation and surface flow pattern on UZ Libræ. In: Astronomische Nachrichten. 2007 ; Vol. 328, No. 10. pp. 1078-1080.
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