Narrow-band polarization measurements of late-type stars

Details Narrow-band polarization measurements of late-type stars Narrow-band polarization measurements of late-type stars

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..211c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Jan. 1, 1985, p. 211-218. Research supported by th

Astronomy and Astrophysics

Astronomy

5

K Lines, Late Stars, Polarimetry, Stellar Spectra, Reference Stars, Statistical Tests, Stokes Law

Scientific paper

Narrow-band polarization measurements at 4870 Å and across the Ca II K line are reported for eight middle to late-type stars. For three stars (α CMi, α Boo and α1Cen) which are regularly used as unpolarized broad-band standards, measurements were made at ±10-4 accuracy or better. At 4870 Å, null results were obtained and with this passband (10 Å), these stars may be considered as narrow-band zero polarization standards. However, around the Ca II K region, the situation is different, there being a strong suspicion that α CMi exhibits a weak fluorescence polarization. A polarization dip at the K line in α Sco has been detected with 95 per cent confidence.

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