High-resolution polarization observations inside spectral lines of magnetic AP stars. I - Instrumentation and observations of Beta Coronae Borealis

Details High-resolution polarization observations inside spectral lines of magnetic AP stars. I - Instrumentation and observations of Beta Coronae Borealis High-resolution polarization observations inside spectral lines of magnetic AP stars. I - Instrumentation and observations of Beta Coronae Borealis

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..462b&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Sept. 1, 1977, p. 462-478. Research supported by the National Research Council of Cana

Astronomy and Astrophysics

Astrophysics

40

A Stars, Magnetic Stars, Polarimeters, Polarization Characteristics, Stellar Magnetic Fields, Circular Polarization, Graphs (Charts), High Resolution, Instrument Errors, Line Spectra, Linear Polarization, Magnetic Field Configurations

Scientific paper

A coude photon-counting polarimeter capable of attaining (with a Fabry-Perot interferometer) a high resolution has been constructed. A description of the instrument is given, with a discussion of various sources of systematic error in the polarimetry. Observations of linear and circular polarization in the spectrum of the Ap star Beta Coronae Borealis, throughout the magnetic cycle, are obtained across an Fe II and a Sm II line at a resolution of 0.086 A. Inferences are drawn regarding the magnetic geometry of the star; the geometry appears to be devoid of any symmetry but can probably still be approximated by a decentered dipole model. The longitudinal magnetic curve of the star is derived from the available data.

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