Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..752h&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 93, Dec. 1981, p. 752-755.
Astronomy and Astrophysics
Astronomy
17
Late Stars, Linear Polarization, Semiregular Variable Stars, Stellar Atmospheres, Supergiant Stars, Convective Flow, Photosphere, Stellar Envelopes
Scientific paper
The semiregular, late-type supergiant Betelgeuse has been intensively monitored over an eight-month interval from 1980-81. As was the case in the preceding observing season, significant ordered (as opposed to stochastic) polarization changes were detected. These changes are explained by the waxing and waning and motion of large-scale elements of the lower atmosphere. Ordered polarization position angle changes are attributed to changes in the orientation of the element. The observations are shown to be inconsistent with a single global nonradial pulsation mode, but are not inconsistent with local modes. These local nonradial pulsation modes are believed to be the cause of the observed polarization variations.
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