| Abstract: | The results of an investigation of polarimetric and IR (IRAS) observations of 12 B-A-F stars are presented. It is shown that
the polarization parameters (P % and θ°) for the stars 66 Oph, SU Cas, HD 206773, EW Lac, and HD 216411 differ markedly in
different colors (U, B, V, R). Color-color diagrams of the dependence of 12] - 60] on 12] - 25], of V- 12] on B - V,
and of 12] - 25] on V- 12] are given. It is shown that the stars SU Cas, α CrB, γ Ser, γ Oph, QR Vul, and HD 183362 have
dust shells of the Vega type. The stars 66 Oph and EWLac are similar in IR color indices to 51 Oph (B9.5Ve), while HD 206773,
HD 208682, HD 216411, and HD 179761 are similar to HD 9672, β Pic, and HR 4796, which have more extended shells.
Translated from Astrofizika, Vol. 43, No. 3, pp. 353-360, July–September, 2000. |
