Magnetic field variations with a rotational period on solar-like star zetaBootis A

Authors
Plachinda, SI Tarasova, TN
Citation
Si. Plachinda et Tn. Tarasova, Magnetic field variations with a rotational period on solar-like star zetaBootis A, ASTROPHYS J, 533(2), 2000, pp. 1016-1022
Citations number
52
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004637X → ACNP
Volume
533
Issue
2
Year of publication
2000
Part
1
Pages
1016 - 1022
Database
ISI
SICI code
0004-637X(20000420)533:2<1016:MFVWAR>2.0.ZU;2-Z
Abstract
We examine the global configuration of the magnetic field of the active dwa rf xi Boo A as a function of stellar rotation phase (P = 6.1455 +/- 0.0003 days), using direct high-precision spectropolarimetric measurements. The ma gnetic field varies from -10 G up to + 30 G. Integrated magnetic flux on th e surface changes polarity during a single rotation period on xi Boo A, res ulting in a flux ratio of Delta Phi(+)/Delta Phi(-) similar to 1.5. This is the first study of the general magnetic field as a function of rotation on a solar-like star other than the Sun.