Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..633c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, June 1, 1986, p. 633-645.
Astronomy and Astrophysics
Astronomy
29
Circular Polarization, Linear Polarization, Polarimetry, Stellar Flares, Stellar Magnetic Fields, Variable Stars, Eclipsing Binary Stars, Magnetic Poles, Stellar Mass Accretion, Stellar Orbits, Stellar Spectrophotometry, Temporal Resolution
Scientific paper
Broadband simultaneous circular and linear polarization observations of VV Puppis during the years 1983-85 with time resolutions down to 20s are presented. From the observed variations around orbit, an inclination about 78 deg and a magnetic colatitude of the principal accreting pole about 155 deg are derived. There is evidence that the accretion column moves around by about 10 deg and that it is sited about 0.01 white-dwarf radius above the surface of the white-dwarf primary. The question of whether VV Pup is an eclipsing system is discussed, but the situation remains unresolved. Polarized radiation from the vicinity of the second magnetic pole is probably present. A reasonable fit with the shock-front cyclotron-emission calculations of Wickramasinghe and Meggitt (1982) is obtained, and it is shown that the ratio of linear to circular polarization is a rough indicator of magnetic-field strength for broadband observations. Strong flaring activity on a time-scale of about 25 is shown to be well correlated with flares observed simultaneously with Exosat. The fractional circular polarization during the flares remains constant.
Cropper Mark
Warner Brian
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