Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..721t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 15, 1985, p. 721-725.
Astronomy and Astrophysics
Astrophysics
16
Binary Stars, Magnetic Stars, Polarimetry, Variable Stars, White Dwarf Stars, X Ray Sources, Light Curve, Linear Polarization, Stellar Spectrophotometry, Stellar Structure
Scientific paper
Linear polarization observations and photometry of the AM Herculis variable E1405 - 451, obtained using the Anglo-Australian Telescope, are presented. A pronounced, but transient, linear polarization pulse was detected at photometric maximum. This is the first detection of a pulse at this phase, although similar features have been reported at photometric minimum. Significant residual polarization is also found which shows a position angle variation of about 70 deg with binary phase. This variation can be modeled with a system geometry having an orbital inclination of about 60 deg, and a colatitude of about 20 for the active magnetic pole of the white dwarf. These parameters assume that the linear pulse observed at photometric maximum corresponds to the closest approach of the magnetic pole to the limb of the white dwarf, which is in accord with circular polarimetry and theoretical expectations.
Tuohy Ian R.
Visvanathan Natarajan
Wickramasinghe Dayal T.
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