The effect of orbital eccentricity on polarimetric binary diagnostics

Details The effect of orbital eccentricity on polarimetric binary diagnostics The effect of orbital eccentricity on polarimetric binary diagnostics

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..787b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 198, Mar. 1982, p. 787-794. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

38

Binary Stars, Eccentric Orbits, Orbital Elements, Polarimetry, Stellar Models, Light Sources, Phase Locked Systems, Point Sources, Polarization Characteristics, Stellar Rotation

Scientific paper

It is found that first and third harmonics are added when eccentricity does not equal zero, where previously only second harmonic variations of polarization were present, when (1) the assumption of corotation implicit in all earlier models of phase-locked polarization variations from close binaries is relaxed, and (2) the simple case of a localized scattering region in an eccentric orbit about a point light source is developed. It is demonstrated that such erroneous model parameter values as the orbital inclination can occur, if a circular-orbit model is assumed in the analysis of data from an eccentric-orbit binary. The extension of the equations to the fitting of noisy data is illustrated through application to the polarimetric data for Cygnus X-1, and it is found that while polarimetric variations observed in Cygnus X-1 cannot be solely caused by any orbital eccentricity, it may contain a contribution due to it.

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