The polarized dust shell around Alpha Orionis. I - New UBV measurements

Details The polarized dust shell around Alpha Orionis. I - New UBV measurements The polarized dust shell around Alpha Orionis. I - New UBV measurements

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168..211l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. 211-216.

Astronomy and Astrophysics

Astrophysics

6

Polarization Characteristics, Stellar Envelopes, Supergiant Stars, Ubv Spectra, Atmospheric Scattering, Electrophotometry, Polarimetry, Red Giant Stars

Scientific paper

Polarimetric observations made with the UBV color system of the light scattered by circumstellar dust around the red supergiant Alpha Orionis, obtained with the 1 and 2-m telescopes at the Pic du Midi Observatory, are presented. Agreement between measurements ranging from 6 to 25 arcsec and previous measurements is found, with polarization in the three colors being nearly tangential and compatible with a r exp -2 decrease of dust density between 10 and 90 arcsec. A possible deviation occurs at about 7 arcsec which could be related to the S2 shell inner boundary. No significant departure from spherical symmetry is noted.

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