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Indications for anti‐solar differential rotation of giant stars
Author(s) -
Weber M.,
Strassmeier K. G.,
Washuettl A.
Publication year - 2005
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200410391
Subject(s) - differential rotation , stars , physics , astrophysics , rotation (mathematics) , doppler imaging , binary star , astronomy , doppler effect , differential (mechanical device) , stellar rotation , geometry , mathematics , medicine , blood pressure , diastole , radiology , thermodynamics
Observational evidence of anti‐solar differential rotation of K‐type giant stars is presented. Time‐series Doppler imaging based on 70 nights of spectroscopic data was used to derive the spot evolution of the stellar surfaces. The relative differential rotation parameters ( α ) of the binary stars IMPeg, HD208472, and HKLac were obtained using two techniques, cross‐correlation analysis and the sheared‐image method. Additionally, two previously published single giant stars are revisited and qualitatively compared to recent theoretical models. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)