Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..935t&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, June 15, 1980, p. 935-940. Research supported by the Natural Sciences and Engineering
Astronomy and Astrophysics
Astrophysics
7
Linear Polarization, Polarimetry, Polarization Characteristics, Stellar Spectra, Variable Stars, Absorption Spectra, Balmer Series, Emission Spectra, H Lines, Mira Variables
Scientific paper
The wavelength dependence of polarization of the prototype Mira variable Omicron Ceti was observed around the time of the 1978 light maximum. Data were obtained at two phases with 20 A resolution between 4000 and 6000 A using the new University of Western Ontario IDS spectropolarimeter. Further observations were obtained using a University of Arizona filter polarimeter and the Royal Observatory Edinburgh scanning spectropolarimeter. The data obtained show polarization generally rising from long wavelengths to shorter ones, with local decreases through the strongest TiO bands and excess polarized flux in H gamma and H delta (which are in emission) and in Ca I at 4226 A (which is in absorption). A strong drop in polarization is also found shortward of H delta. These data are provisionally interpreted as resulting from the effects of scattering in an atmosphere which is not uniformly bright.
Coyne George V.
Landstreet John Darlington
McLean Ian S.
Tomaszewski L.
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