Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..203b&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 203-207. NASA-supported research.
Astronomy and Astrophysics
Astronomy
14
Binary Stars, Late Stars, Optical Polarization, Stellar Radiation, Stellar Spectra, Ultraviolet Astronomy, Hydrogen, Neutral Gases, Power Spectra, Rayleigh Scattering, Stellar Temperature, Ultraviolet Spectra
Scientific paper
Using measurements on 79 nights in 1980 January-August, it is established that the polarization in the ultraviolet (U band) varies synchronously on the known binary period of 2.6132 days, with a peak-to-peak amplitude of 0.03%. The pattern is mainly second harmonic in character, as typical of binary star examples such as Algol and Upsilon Her. Reflection by the cooler star, by a plasma concentration, or both, is suggested. The scale of the polarization seems to be consistent with Rayleigh scattering by neutral hydrogen on the cooler star, and a roughly lambda to the -4th wavelength dependence should be searched for. The QU curve suggests a sizeable inclination for the system, of about 45 deg, but this is preliminary. Separately, a possible weak periodicity might be present on a subsidiary period, conceivably related to a rotating star spot.
Barbour M. S.
Kemp James C.
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