Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..405..517k&link_type=abstract
Solar Polarization 5: In Honor of Jan Stenflo ASP Conference Series, Vol. 405, proceedings of the conference held 17-21 Septembe
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The fact, that late-type stars exhibit complex and small scale surface magnetic fields, imposes special requirements on their observation as well as on their modeling and reconstruction. Our new Zeeman-Doppler imaging code iMap, which we present here, was particularly designed for the application to late type stars. It does full radiative transfer calculations and utilizes a regularization scheme which is based on local maximum entropy. Furthermore a new multi-line cross-correlation technique by means of a Principal Component Analysis is used to enhance the quality of individual observed polarized line profiles.
In a first application we present Zeeman-Doppler images of II Pegasi, which reveal a surprisingly large scale surface structure with one predominant magnetic longitude, containing a mainly radially oriented field.
Carroll Andrew T.
Ilyin I. I.
Kopf Markus
Strassmeier Klaus G.
Tuominen Ilkka
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