Journal Article

First measurement of the magnetic field on FK Com and its relation to the contemporaneous star-spot locations*

H. Korhonen, S. Hubrig, S. V. Berdyugina, Th. Granzer, T. Hackman, M. Schöller, K. G. Strassmeier and M. Weber

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 1, pages 282-289
Published in print May 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14263.x
First measurement of the magnetic field on FK Com and its relation to the contemporaneous star-spot locations*

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In this study, we present simultaneous low-resolution longitudinal magnetic field measurements and high-resolution spectroscopic observations of the cool single giant FK Com. The variation of the magnetic field over the rotational period of 2.4 d is compared with the star-spot location obtained using Doppler imaging techniques, V-band photometry and VI colours. The chromospheric activity is studied simultaneously with the photospheric activity using high-resolution observations of the Hα, Hβ and Hγ line profiles. Both the maximum (272 ± 24 G) and minimum (60 ± 17 G) in the mean longitudinal magnetic field, 〈Bz〉, are detected close to the phases where cool spots appear on the stellar surface. A possible explanation for such a behaviour is that the active regions at the two longitudes separated by 0.2 in phase have opposite polarities.

Keywords: stars: activity; stars: individual: FK Comae Berenices; stars: late-type; stars: magnetic fields; stars: spots

Journal Article.  5563 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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