Simulating the emission line radial velocity modulation in discless intermediate polars.

Details Simulating the emission line radial velocity modulation in discless intermediate polars. Simulating the emission line radial velocity modulation in discless intermediate polars.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279..940g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 279, No. 3, p. 940 - 948

Other

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Accretion, Accretion Discs -- Binaries: Close -- Stars: Individual: Bg Cmi -- Stars: Magnetic Fields -- Novae, Cataclysmic Variables -- Stars: Variables: Other, Polars: Models, Polars: Accretion, Polars: Radiative Transfer

Scientific paper

A code has been developed which simulates the emission line radial velocity modulation expected in a discless intermediate polar, where the bulk of the accretion flow flips from one magnetic pole to the other twice every beat cycle. The situation is found to produce a radial velocity curve which exhibits a modulation at the beat period, although this is not strictly periodic in that it is modified by an intrinsic underlying orbital modulation; i.e., the morphology of the beat modulation over one beat cycle depends on the orbital phase. Interestingly, it is found that, when the resultant velocity curve over one orbital cycle is folded on the beat period and binned coarsely, a quasisinusoidal velocity profile can be reproduced, depending on the values chosen for the various free parameters. An important implication of this result is that the spin period of BG Canis Minoris could indeed be 847 s, and is not necessarily 913 s as the author had previously concluded. The model is also capable of reproducing the modulation seen in the newly discovered system RX J1712.6-2414.

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