Indications for anti-solar differential rotation of giant stars

被引：39
|
作者：
Weber, M [1 ]
Strassmeier, KG [1 ]
Washuettl, A [1 ]
机构：
[1] AIP, D-14482 Potsdam, Germany
来源：
ASTRONOMISCHE NACHRICHTEN | 2005年 / 326卷 / 3-4期
关键词：
stars : spots; stars : activity; stars : imaging; stars : individual (IM Peg; HD; 208472; HK Lac; KU Peg; 31993);
D O I：
10.1002/asna.200410391
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 (a) of the binary stars IM Peg, HD 208472, and HK Lac 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. (c) 2005 WILEY-VCH Verlag GmbH O Co. KGaA, Weinheim.
引用
收藏
页码：287 / 291
页数：5
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