Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205p...1b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Oct. 1983, p. 1P-7P.
Astronomy and Astrophysics
Astronomy
38
Astronomical Photometry, Binary Stars, Polarimetry, X Ray Sources, Circular Polarization, Cyclotron Radiation, Light Curve
Scientific paper
The authors report photometry and polarimetry of the AM Her-type binary E1405-451. For the first time circular polarization has been detected in such an object at wavelengths longer than 1 μm. The light curves and polarization curves at J and H show a minimum centred on the optical minimum but very much narrower. At H significant polarization is only observed for a short period on either side of the minimum. The observations are in good agreement with the predictions of cyclotron models. The form of the polarization curve indicates that the accretion column is always in the hemisphere of the white dwarf towards us, and that the field becomes almost parallel to the line-of-sight at the phase of the minimum.
Axon David J.
Bailey Jeremy
Giles Barry A.
Greenhill John G.
Hough James H.
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