Polarization Characteristics of the Relativistic Binary Pulsar B1534+12

Details Polarization Characteristics of the Relativistic Binary Pulsar B1534+12 Polarization Characteristics of the Relativistic Binary Pulsar B1534+12

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.3710a&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #37.10; Bulletin of the American Astronomical Society, Vol. 25, p.1346

Astronomy and Astrophysics

Astronomy

Scientific paper

We have made high time-resolution polarimetric observations of the 37.9ms relativistic binary pulsar B1534+12. Roughly 20% of the main pulse emission is linearly polarized, and the position-angle swing within the pulse shows structure clearly inconsistent with purely dipolar emission. Our measurements were also sensitive to low-level off-pulse emission, allowing us to trace the variation in polarization angle, globally dipolar in nature, through a substantial fraction of the pulsar's rotation period. A preliminary rotating vector model fit to the position-angle swing results in an impact parameter (the angle between the magnetic axis of the pulsar and our line of sight) of beta = (3.5 +/- 1.5)(deg) and a magnetic alignment (the angle between the spin and magnetic axes of the pulsar) of alpha = (106 +/- 8)(deg) . In addition to providing the geometry of the system and clues to the pulsar's emission mechanism, these measurements form a pulse polarization ``template'' against which future observations can be compared in order to constrain or detect the effects of relativistic precession of the pulsar's spin axis in its binary orbit.

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