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The V-Stokes Parameter as a Manifestation of Envelope Activity for Cool, Bright, Evolved Stars

Published online by Cambridge University Press:  12 April 2016

B. D. Holenstein ,
R. H. Koch  and
R. J. Pfeiffer
B. D. Holenstein
Affiliation:
Department of Astronomy and AstrophysicsUniversity of Pennsylvania
R. H. Koch
Affiliation:
Department of Astronomy and AstrophysicsUniversity of Pennsylvania
R. J. Pfeiffer
Affiliation:
Department of Physics TrentonState College

Extract

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At Pennsylvania’s Flower and Cook Observatory, instrumentation has been developed to measure simultaneously the four Stokes parameters of the filtered radiation field from a celestial source. The instrumental Q/U/V-parameters have been found to be very small and well-behaved. Thus far, the program has concentrated on cool bright giants and supergiants and on hot, evolving close binaries. A single season’s investigation of Alp Ori has already been reported (Holenstein 1987) and the present paper is a summary of current results for the cool, evolved program stars.

For Psi1 Aur, V CVn, 6 Gem, 72 Leo and 119 Tau no V-signal at the level of 3σhas been detected from data from the 1986-1987 season. At the level of 0.0n%, unambiguous and variable V-signals have been detected for VV Cep, Mu Cep, Alp Her, Alp Ori, Bet Peg, and Alp Sco.

Type
Part II. Mass-Losing Stars in Different Stages of Evolution
Information
International Astronomical Union Colloquium , Volume 108: Atmospherics Diagnostics of Stellar Evolution: Chemical Peculiarity, Mass Loss, and Explosion , 1988 , pp. 189 - 190
Copyright
Copyright © Springer-Verlag 1988

References

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