Simultaneous five color (UBVRI) polarimetry of EF ERI

Details Simultaneous five color (UBVRI) polarimetry of EF ERI Simultaneous five color (UBVRI) polarimetry of EF ERI

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.130..197p&link_type=abstract

(IAU, DFG, and Bayerisches Staatsministerium für Unterricht und Kultus, Colloquium on Cataclysmic Variables, Recent Multi-Freque

Astronomy and Astrophysics

Astrophysics

1

Flare Stars, Polarimetry, Stellar Mass Accretion, Stellar Spectrophotometry, Infrared Photometry

Scientific paper

The first observations of the AM Her type object EF Eri where both the polarization and the photometric data are recorded simultaneously in five color bands (UBVRI) are presented. The position angle rotates strongly (about 30 deg) vs. wavelength from U to I, probably due to Faraday rotation or due to fact that the polarized radiation see in the different wavelength bands comes from different parts of the accretion region. The phase dependence of the position angle requires field and accretion geometry more complicated than a simple centered dipole and a second emitting region producing weaker intermediate pulses in the infrared seems to be present. The value of the inclination of the system i = 55 + or - 5 deg, the colatitude of the active pole = 38 + or - 5 deg, and the second emitting region beta 2 = 115 + or - 5 deg, are derived.

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