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Evidence of magnetic accretion in an SW Sex star: discovery of variable circular polarization in LS Pegasi | | P. Rodriguez-Gil
; J. Casares
; I. G. Martinez-Pais
; P. Hakala
; D. Steeghs
; | | Date: |
15 Nov 2000 | | Subject: | astro-ph | | Affiliation: | 1,2), P. Hakala , D. Steeghs ( IAC, Spain; Univ. of La Laguna, Spain; Univ. of Turku, Finland; Univ. of Southampton, UK | | Abstract: | We report on the discovery of variable circular polarization in the SW Sex star LS Pegasi. The observed modulation has an amplitude of ~0.3 % and a period of 29.6 minutes, which we assume as the spin period of the magnetic white dwarf. We also detected periodic flaring in the blue wing of Hbeta, with a period of 33.5 minutes. The difference between both frequencies is just the orbital frequency, so we relate the 33.5-min modulation to the beat between the orbital and spin period. We propose a new accretion scenario in SW Sex stars, based on the shock of the disk-overflown gas stream against the white dwarf’s magnetosphere, which extends to the corotation radius. From this geometry, we estimate a magnetic field strength of B(1) ~ 5-15 MG. Our results indicate that magnetic accretion plays an important role in SW Sex stars and we suggest that these systems are probably Intermediate Polars with the highest mass accretion rates. | | Source: | arXiv, astro-ph/0011296 | | Services: | Forum | Review | PDF | Favorites | |
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