Zeeman-Doppler imaging - A new option for magnetic field study of AP and solar-type stars

Details Zeeman-Doppler imaging - A new option for magnetic field study of AP and solar-type stars Zeeman-Doppler imaging - A new option for magnetic field study of AP and solar-type stars

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..128..227d&link_type=abstract

(IAU, The Inside the Sun Colloquium, 121st, Versailles, France, May 22-26, 1989) Solar Physics (ISSN 0038-0938), vol. 128, July

Physics

16

A Stars, Doppler Effect, Peculiar Stars, Stellar Magnetic Fields, Zeeman Effect, Magnetic Field Configurations, Solar Magnetic Field, Starspots, Stellar Flares

Scientific paper

A new technique, designated Zeeman-Doppler imaging (ZDI), is described which is based on the rotational modulation study of a rapid rotator Stokes parameter, V(lambda), measured with both high spectral resolution and high S/N. Both the instrumentation and the observing procedure are described which provide S/N values up to 3000 and make it possible to detect unambiguously a magnetic field on the Ap star Epsilon UMa. As a qualifying test for ZDI, a 15-point phase coverage obtained on the well-known magnetic Ap star alpha2CVn (with S/N values of 400-1100) is compared to the results of Borra and Landstreet (1977).

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