On the linear polarization of close binaries

Details On the linear polarization of close binaries On the linear polarization of close binaries

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pasp...89..147p&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 89, Apr.-May 1977, p. 147-154.

Astronomy and Astrophysics

Astronomy

23

Eclipsing Binary Stars, Polarization Characteristics, Stellar Evolution, Astronomical Catalogs, Main Sequence Stars, Mass Transfer, Photosphere, Stellar Envelopes

Scientific paper

There now exist thousands of filtered and unfiltered linear polarization measures distributed among dozens of close binaries. This assemblage of data is studied for the incidence of polarization variability among the binary systems. With the exception of U Oph, unevolved binaries do not show intrinsic polarization. It is relatively easy to detect polarization variability among evolved pairs whose photospheres are separated by at least 10 solar radii. For evolved pairs closer together than this threshold value, an assortment of factors is described which makes it difficult to detect the systemic polarization unless mass transfer is proceeding vigorously. The cause of the binary polarization is commonly scattering from circumstellar material, but in some systems the same mechanisms which cause polarization variability in single cool giants may be operating.

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