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- W204232650 abstract "We propose a method to measure difference between positions of centroids of polarized and total flux of astronomical object in visible light, which we call for brevity polaroastrometry. Method efficiency is being demonstrated by the example of reduction of observations carried out with an instrument combining features of two-beam polarimeter with rotating half-wave plate and speckle interferometer, at 70-cm telescope in $V$ band. For the total number of accumulated photoelectrons $N_e=10^9$, which corresponds to series duration of 500 sec and object magnitude $V=6^m$, the method precision is 60-70 $mu$as in terms of 1$sigma$. At smaller $N_e$ precision decays as $sim 1.7^{primeprime}/sqrt{N_e}$, while at larger $N_e$ it remains the same due to imperfections of the half-wave plate. For the main sequence stars, non-polarized and polarized by interstellar dust, we didn't detect significant polaroastrometric signal. For the Mira variable star $chi$ Cyg total amplitudes of the polaricenters were found to be $310pm70$ $mu$as and $300pm70$ $mu$as, for Stokes parameters $Q$ and $U$, respectively. For $o$ Cet these values are $490pm100$ $mu$as and $1160pm100$ $mu$as, for R Tri polaricenters coincide with the photocenter to the level of error." @default.
- W204232650 created "2016-06-24" @default.
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- W204232650 date "2015-01-15" @default.
- W204232650 modified "2023-10-14" @default.
- W204232650 title "Visible light polaroastrometry of astronomical objects" @default.
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