Circular polarimetry of an active VV Puppis - Evidence for two accreting poles

Details Circular polarimetry of an active VV Puppis - Evidence for two accreting poles Circular polarimetry of an active VV Puppis - Evidence for two accreting poles

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..652l&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, Apr. 15, 1979, p. 652-656.

Astronomy and Astrophysics

Astrophysics

57

Circular Polarization, Eclipsing Binary Stars, Magnetic Stars, Polarimetry, Stellar Mass Accretion, Variable Stars, Light Curve, Linear Polarization, Magnetic Poles, Polarized Radiation, White Dwarf Stars

Scientific paper

Broadband circular-polarization observations, including some simultaneous two-color polarimetric measurements, of the AM Her-type variable star VV Pup are analyzed which were obtained when the system was in an active state with an apparent visual magnitude near 15 at maximum light and 15.8 at minimum. It is found that VV Pup in the active state exhibited steady negative circular polarization throughout its eclipse phase in March 1978 and in April 1978. This polarization is interpreted as evidence that the additional eclipse-phase radiation is due to accretion onto a second region of the degenerate star, where the longitudinal component of the magnetic field is of the opposite sign with respect to that at the primary accreting pole. The simplest assumption consistent with the observed long-term stability of the phasing and eclipse durations in VV Pup is shown to be that the magnetic field is a centered dipole phase-locked with the orbital rotation

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