Linear polarization variations of AC Herculis

Details Linear polarization variations of AC Herculis Linear polarization variations of AC Herculis

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992azh....69..106p&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 69, no. 1, Jan.-Feb. 1992, p. 106-115. In Russian.

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Astronomical Polarimetry, Linear Polarization, Stellar Atmospheres, Variable Stars, Astronomical Photometry, Stellar Magnetic Fields

Scientific paper

The degree of the intrinsic polarization of the RV Tau-type star AC Her experiences three increases during a 75-d period. The largest polarization maximum corresponds to the main light minimum. The wavelength dependence of the polarization changes during the period. The dependence increases exponentially toward shorter wavelengths during the whole main light minimum (at phases from approximately 0.8 to 1.2). The polarization is much smaller and p(lambda) is much smoother during the rest of the period. The application of the working hypothesis concerning active longitudes on a stellar surface to AC Her is discussed briefly.

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