Polarization properties of silicate-like grains in circumstellar envelopes of late-type stars due to temperature variations |
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| Authors: | J Svatoš M Šolc V Vanýsek |
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| Institution: | 1. Dept. of Astronomy and Astrophysics, Charles University, Prague, Czechoslovakia
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| Abstract: | The influence of temperature changes in circumstellar silicate-like envelopes upon the polarization effects is investigated. It is shown that under the assumption that ΔT g>50° and conductivity of silicate grains is indirectly proportional toT g 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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