2007/11/05 by Zs. Kõvári, Zs. Kőovári, J. Bartus +7
Physics and Astronomy · #Astronomy and Astrophysical Research #Scientific Research and Discoveries #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1002/asna.200710874
3 pages, 3 figures, conference title: 5th Potsdam Thinkshop, accepted for publication in Astronomische Nachrichten
arxiv created 2007/11/05 · openalex publication_date 2007/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 ± 10ms‐1. This result agrees with our recent findings from another study and could also be confirmed theoretically. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)