Polarimetric study of the RV Tauri star AC Herculis

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

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989basi...17...95r&link_type=abstract

Astronomical Society of India, Bulletin (ISSN 0304-9523), vol. 17, Sept. 1989, p. 95-101.

Astronomy and Astrophysics

Astronomy

1

Polarimetry, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Infrared Radiation, Linear Polarization, Stellar Envelopes

Scientific paper

BVRI polarimetry of AC Her shows that the wavelength dependence of polarization is weak with a marginal increase towards blue and that the position angle is nearly independent of wavelength. It is argued that the interstellar component of polarization in the direction of AC Her is negligile (less than 0.1 percent). The polarization observed in AC Her most probably results from a combination of pulsation related asymmetry in the star and circumstellar grain scattering; and its variation during a light cycle is not caused by changes in the circumstellar dust envelope but rather by the changes in asymmetry in the star.

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