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Ubvri Polarization Measurements of Post AGB Stars
Published online by Cambridge University Press: 07 August 2017
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UBVRI polarization measurements of 25 post AGB stars with circumstellar dust shells (CDSs) were made. Most of them show A, F, G, K supergiant type spectra. IRAS data of these stars show evidence for the presence cool detached circumstellar dust envelopes. Some of these stars also have warm dust shells. Many show significant polarization. The observed polarization in UBVRI is most likely due to scattering of the central star radiation by CDSs. Some of these stars show variation in polarization and position angle. The polarization data suggest that several may have aspherical or bipolar CDSs.
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- IV. Planetary Nebulae Connection: Evolution from the AGB
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- Copyright © Kluwer 1993
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