Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..669d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. 669-681.
Astronomy and Astrophysics
Astrophysics
38
Astronomical Spectroscopy, Binary Stars, Circular Polarization, Stellar Spectra, Dwarf Stars, G Stars, Stellar Atmospheres, Stellar Convection, Stellar Magnetic Fields, Zeeman Effect
Scientific paper
We applied the new technique of Zeeman-Doppler Imaging on nine active RS CVn binary systems. In four systems (HR 1099, sigma 2 CrB, II Peg and UX Ari), we detected a magnetic field on the cool active component; in each of them, the corresponding Stokes V signatures is found to vary with rotational phase. Moreover, on HR 1099, we have observational evidence that the magnetic structure varied significantly within a period of 1.3 yr. By contrast, magnetic field is repeatedly not detected on other stars, such as the hotter component of sigma 2 CrB, although these are also chromospherically very active. Our results suggest that the horizontal size scale of magnetic topologies may differ significantly among the observed stars. Large monopolar regions are likely present on those for which Zeeman signatures are detected; a more complex ordering of field lines with smaller monopolar regions and close bipolar groups may define the others.
Donati Jean-Francois
Rees David E.
Semel Meir
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