Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213l..13c&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 213, Apr. 1, 1977, p. L13-L16.
Astronomy and Astrophysics
Astrophysics
60
Binary Stars, Stellar Luminosity, Stellar Models, Variable Stars, White Dwarf Stars, X Ray Sources, Circular Polarization, Magnetic Stars, Periodic Variations, Radial Velocity, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Rotation, Stellar Spectra
Scientific paper
The main characteristics of optical brightness variations, X-radiation, and polarization variations observed in the variable blue star AM Her, the suggested optical counterpart of the high-galactic-latitude X-ray source 3U 1809+50, are explained in terms of a model where an essentially synchronously rotating magnetic white dwarf undergoes accretion in a binary system, with the gas stress from the companion producing a hot spot above the near magnetic pole of the white dwarf. Optical phenomena examined include primary and secondary minima in the V and R bands as well as variations in linear and circular polarization. It is proposed that the source of X-radiation is probably the region of the near magnetic pole and that precession or accretion torques on the white dwarf could be responsible for changes in the phase relations of the observed periodic variations. Similarities between the AM Her system and the old nova DQ Her are briefly noted.
Chanmugam G.
Wagner Raymond L.
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