Narrow band polarimetry of a sample of cool giants and supergiants

Details Narrow band polarimetry of a sample of cool giants and supergiants Narrow band polarimetry of a sample of cool giants and supergiants

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147..111s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 1, June 1985, p. 111-114. Research supported by the Science and Engin

Astronomy and Astrophysics

Astrophysics

5

Cool Stars, Giant Stars, Linear Polarization, Stellar Luminosity, Stellar Temperature, Supergiant Stars, Hertzsprung-Russell Diagram, Wavelengths

Scientific paper

Polarimetric observations of a sample of cool giant and supergiant stars are presented. The measurements were made with the Glasgow polarimeter using narrow wavelength bands (10 Å FWHM) centred on Ca II K and Hβ. In the data reduction the biasing effects have been taken into account using the techniques described by Clarke et al. (1983). The contribution made by the interstellar polarization (ISP) has been calculated and removed from the data. The resulting polarization values show a correlation with spectral type, the cooler types being more highly polarized. This behaviour of the degree of polarization is in qualitative agreement with the model predictions of Schwarz and Clarke (1984).

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