Linear polarization measurements of the AM Herculis objects H0139-68 and E1405-451

Details Linear polarization measurements of the AM Herculis objects H0139-68 and E1405-451 Linear polarization measurements of the AM Herculis objects H0139-68 and E1405-451

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275..709v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 15, 1983, p. 709-712.

Astronomy and Astrophysics

Astrophysics

23

Binary Stars, Linear Polarization, Magnetic Stars, Stellar Radiation, Variable Stars, X Ray Sources, Cyclotron Radiation, Light Curve, Stellar Oscillations, White Dwarf Stars

Scientific paper

Linear polarization observations of the optical counterparts of H0139-68 and E1405-451 are reported. Polarization pulses near photometric minimum were detected in the V band for both X-ray sources, confirming their classification as AM Her objects. A secondary linear polarization pulse was also observed approximately half a cycle later for H0139-68; this is the first such detection among the AM Her class and suggests that cyclotron emission is being produced at both poles of the magnetic white dwarf. There is also evidence for weak linear polarization (approximately 2 percent) at all binary phases for H0139-68 and E1405-451, indicating an additional component in their continua.

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