Polarimetric observations of the RV Tauri star AC Herculis

Details Polarimetric observations of the RV Tauri star AC Herculis Polarimetric observations of the RV Tauri star AC Herculis

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97.1192h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Dec. 1985, p. 1192-1195. NSF-supported research.

Astronomy and Astrophysics

Astronomy

12

Polarimetry, Stellar Envelopes, Stellar Oscillations, Variable Stars, Light Curve, Peculiar Stars

Scientific paper

Polarimetric observations in the B band were obtained over one cycle of the 75.46-day period and on four nights in the V band. A correlation between the light and polarization changes is clearly evident. The variations in the polarization exhibit first and third harmonic behavior with an amplitude of approximately 1.0%. The maximum polarization occurs just after the primary light minimum. The path of the polarization on the equatorial Q, U plane is elongated along an axis which makes an angle 2θ = 145°±3° with the +Q axis. This suggests either nonradial pulsations in the star or radial pulsations propagating into an asymmetrical circumstellar medium.

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