First ultraviolet spectropolarimetry of hot supergiants

Details First ultraviolet spectropolarimetry of hot supergiants First ultraviolet spectropolarimetry of hot supergiants

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382l..85t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 382, Dec. 1, 1991, p. L85-L88.

Astronomy and Astrophysics

Astrophysics

18

Astronomical Polarimetry, Hot Stars, Supergiant Stars, Ultraviolet Spectra, Cassiopeia Constellation, Cygnus Constellation, Early Stars, Interstellar Matter, Opacity, Stellar Envelopes

Scientific paper

UV spectropolarimetric observations of the early-type supergiant stars P Cygni and Kappa Cassiopeiae obtained with the Wisconsin UV Photo-Polarimeter Experiment (WUPPE) are presented. Contrary to model predictions, the intrinsic polarization of P Cyg remains constant in the Balmer continuum except for a broad dip between 2600 and 3000 A. This decrease in polarization is discussed in terms of possible Fe line blanketing effects. The intrinsic position angle is essentially constant in the UV except for a rotation across the feature between 2600 and 3000 A. The intrinsic polarization of Kappa Cas is small; most of the observed polarization is interstellar in nature. The Serkowski curve extrapolated into the UV is found to fall consistently below the observed polarization. A slight rotation in position angle from optical to UV wavelengths is noted. Very good agreement is found between the mean continuum polarization obtained by WUPPE and the broadband UV polarization measurement obtained by Gehrels (1968).

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