The variability of polarized standard stars

Details The variability of polarized standard stars The variability of polarized standard stars

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..900b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 900-910. Sponsorship: NSERC-suported research.

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Early Stars, Extragalactic Radio Sources, Giant Stars, Linear Polarization, Signal To Noise Ratios, Variable Stars, Computational Astrophysics, Error Analysis, Gallium Arsenides, Telescopes

Scientific paper

The linear polarization of 11 out of a total of 13 standard polarized stars has been found to be variable. This implies that these 11 stars, mostly giants and supergiants but also four early-type main-sequence stars, exhibit some level of small, variable, intrinsic polarization. Therefore, they are not suitable as polarized standards for accurate polarimetry. The problem of finding suitable candidates for standard polarized stars is therefore nontrivial and basically still unsolved. The general increase in the level of polarization variability with mean polarization may be partly interstellar in origin, analogous to radioflux scintillations seen in extragalactic radio sources.

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