Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447..889f&link_type=abstract
Astrophysical Journal v.447, p.889
Astronomy and Astrophysics
Astronomy
Polarization, Stars: Individual Constellation Name: Alpha Camelopardalis, Stars: Individual Constellation Name: Kappa Cassiopeiae, Stars: Supergiants, Ultraviolet: Stars
Scientific paper
The OB supergiants α Cam and κ Cas are intrinsically very similar stars at comparable distances. Apart from a constant offset in the polarization of ≃0.2%, both stars exhibit the same polarimetric variation between 140° and 800° Å. Several possible mechanisms to explain the polarimetric observations are investigated. We propose that the polarization mechanism may be due to grain formation in an extended shell where the stellar wind and the interstellar medium interact. If this interpretation is correct, then it implies that the physical process giving rise to grain formation is not strongly correlated to the stellar wind parameters.
Bjorkman Karen S.
Brown John C.
Fox Geoffrey K.
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