Polarimetric observations of 44i Bootis.

Details Polarimetric observations of 44i Bootis. Polarimetric observations of 44i Bootis.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pobeo..54..121n&link_type=abstract

Publications of the Astronical Observatory of Belgrade, No. 54, p. 121 - 125

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Visual Binaries: Polarization, Visual Binaries: W Uma Stars

Scientific paper

Linear optical observed polarization of the visual binary 44i Boo was measured with the Belgrade polarimeter in the period 1983 - 1990. The aim of the polarimetric observations was the investigation of possible polarization changes that are correlated with ≡0d2678 photometric change. The star has high galactic latitude (b = 70°) and very possibly zero interstellar polarization. Detected polarization could be interpreted as due to scattering in circumstellar envelopes. Time variation, if detected, may lead to some important conclusions about geometry of the system. The polarization percentage ranges between 0.01% and 0.19% and polarization angles take almost all values between 0 and 180 degrees. Fourier analysis of polarization percentage data fails to give clear evidence of time dependent polarization. On the other side, a statistical test (Pfeiffer, 1977) for Q and U Stokes parameters leads to strong time variation of the parameter Q, but not for U.

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