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Ubvri Polarization Measurements of Post AGB Stars

Published online by Cambridge University Press:  07 August 2017

M. Parthasarathy  and
S.K. Jain
M. Parthasarathy
Affiliation:
Indian Institute of Astrophysics, Bangalore - 560034, India
S.K. Jain
Affiliation:
Indian Institute of Astrophysics, Bangalore - 560034, India

Extract

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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.

Type
IV. Planetary Nebulae Connection: Evolution from the AGB
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 353
Copyright
Copyright © Kluwer 1993