Surface velocity network with anti-solar differential rotation on the active K-giant σ Geminorum

Zs Kovári, J. Bartus, M. Švanda, K. Vida, K. G. Strassmeier, K. Oláh, E. Forgács-Dajka

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We demonstrate the power of the local correlation tracking technique on stellar data for the first time. We recover the spot migration pattern of the long-period RS CVn-type binary σ Gem from a set of six Doppler images from 3.6 consecutive rotation cycles. The resulting surface flow map suggests a weak anti-solar differential rotation with α ≈ -0.0022 ± 0.0016, and a coherent poleward spot migration with an average velocity of 220 ± 10 ms-1. This result agrees with our recent findings from another study and could also be confirmed theoretically.

Original languageEnglish
Pages (from-to)1081-1083
Number of pages3
JournalAstronomische Nachrichten
Volume328
Issue number10
DOIs
Publication statusPublished - Oct 1 2007

Keywords

  • Stars: activity
  • Stars: imaging
  • Starspots

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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