Simultaneous UBVRI polarimetry of VV Puppis during an active phase

Details Simultaneous UBVRI polarimetry of VV Puppis during an active phase Simultaneous UBVRI polarimetry of VV Puppis during an active phase

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..245p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. 245-254.

Astronomy and Astrophysics

Astrophysics

16

Cataclysmic Variables, Polarimetry, Stellar Activity, Stellar Spectrophotometry, Ubv Spectra, X Ray Binaries, Circular Polarization, Cyclotron Radiation, Linear Polarization, Polarized Light, Stellar Magnetic Fields

Scientific paper

UBVRI observations of the magnetic cataclysmic variable VV Pup, obtained using a five-color simultaneous photopolarimeter on the 1.5-m Danish telescope at ESO during active phases in January 1986 and February 1988, are reported. The data are presented in extensive tables and graphs and characterized in detail, with reference to theoretical models. Pulses of linear polarization are observed, with maxima in the blue, at the beginning of the bright phase (when the active pole appears) and at the end of the bright phase (when the active pole is about to disappear over the limb); p(B) = 7 and 20 percent, respectively. Circular polarization is positive and strong in the bright phase, but reverses sign in B and V during the faint phase. These phenomena are attributed to different accretion rates onto separate spots on the surface of the white dwarf.

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