Results of new polarimetric observations of the unusual interacting binary HD 207739

Astronomy and Astrophysics – Astronomy

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Astronomical Polarimetry, Binary Stars, Gas Flow, Peculiar Stars, Stokes Law Of Radiation, Fourier Series, Linear Polarization, Ultraviolet Astronomy

Scientific paper

Polarimetric observations of the unusual interacting binary HD 207739 have shown the existence of variable phase-dependent intrinsic linear polarization. It is demonstrated that the observed variations of Stokes parameters are well represented by Fourier expansion up to the second harmonics. The second-harmonic terms dominate, and their analysis yields an orbital inclination value of 77 +/- 2 deg. Analysis of the phase dependence of the polarization provides information about the location of gaseous streams in the binary. It is shown that the gaseous stream which produces the scattered light should be located between the components at an angle of 45 deg to the line connecting the components' centers. The system's evolutionary status is discussed briefly.

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