Spectropolarimetry of Omicron Ceti around the 1978 maximum

Abstract

view Abstract Citations (10) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectropolarimetry of OMI CET around the 1978 maximum. Tomaszewski, L. ; Landstreet, J. D. ; McLean, I. S. ; Coyne, G. V. Abstract 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. Publication: The Astrophysical Journal Pub Date: June 1980 DOI: 10.1086/158057 Bibcode: 1980ApJ...238..935T Keywords: Linear Polarization; Polarimetry; Polarization Characteristics; Stellar Spectra; Variable Stars; Absorption Spectra; Balmer Series; Emission Spectra; H Lines; Mira Variables; Astrophysics full text sources ADS | data products SIMBAD (1)