Polarization properties of silicate-like grains in circumstellar envelopes of late-type stars due to temperature variations

Astronomy and Astrophysics – Astrophysics

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Late Stars, Polarization Characteristics, Refractivity, Silicates, Stellar Envelopes, Temperature Effects, Astronomical Models, Graphite, Nebulae, Optical Properties, Temperature Distribution

Scientific paper

The influence of temperature changes in circumstellar silicate-like envelopes upon the polarization effects is investigated. It is shown that under the assumption that ATg>50° and con- ductivity of silicate grains is indirectly proportional to Tg this mechanism can be responsible for the observed dependence of intensity vs polarization in some late-type stars, e.g. V CVn. The same effects can be produced by dirty ices and graphite grains. It is suggested that irradiation by electrons and/or protons can affect the circumstellar envelopes in a similar way, especially those of early-type stars, and irradiation by neutrons can exert an influence on the envelopes of supernovae

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