Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..485r&link_type=abstract
SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,
Astronomy and Astrophysics
Astrophysics
Scientific paper
Simultaneously mapping abundance inhomogeneities and magnetic fields of chemical particular (CP) stars is of strong interest to better understand the key role of magnetism in the atmosphere structuration, in ion migration and chemical stratification in particular. But since magnetic fields and chemical inhomogeneities are closely related, they link to similar effects on classical observables and we are more often obliged to reconstruct magnetic and abundance maps either independantly or according to several assumptions. To overcome that, we propose to take benefit of optical aperture synthesis arrays to resolve local magnetic structures and patchy stellar surfaces. This requires to be able to polarimetrically resolve magnetic lines and thus to add a polarimetric device at the combined focus of an interferometric array. Within this instrumental context, it becomes possible to map magnetic fields thanks to visibility and phase measurements in circularly polarized light and to map abundance inhomogeneities thanks to "classical" interferometric measurements (i.e. without the polarimeter). In this poster we show how the interference fringe phase is the suitable observable for polarimetric measurements and for mapping patchy surfaces (see also Jankov et al. in these proceedings). We illustrate that on various typical cases of magnetic topology and abundance distribution and we detail the case of the well-known CP star alpha2CVn on which we provide the expected results with the operation instruments.
Jankov Slobodan
Le Bouquin Jean-Baptiste
Rousselet-Perraut Karine
Stehlé Chantal
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