Quasi-Periodic Oscillations in AM Herculis - Repeat for HOPR#87/95

Details Quasi-Periodic Oscillations in AM Herculis - Repeat for HOPR#87/95 Quasi-Periodic Oscillations in AM Herculis - Repeat for HOPR#87/95

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4801c&link_type=abstract

HST Proposal ID #4801

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #4801 Stellar Astrophysics

Scientific paper

AM Her variables are close-binary systems in which a white dwarf with a magnetic field of 20--70 MG accretes matter from a companion star. Theoretical studies of magnetically channeled accretion flows in such systems predict that the shock formed near the white dwarf should oscillate with periods of order 0.1--1 s. Optical high-speed photometry has indeed shown the existence of such rapid, quasi-periodic oscillations in some AM Her binaries, but not in others. We will use HST to obtain ultraviolet high-speed photometry of several AM Her systems, in order to explore further the nature of the oscillations, and to extend the search into the UV. HSP observations of two systems (VV Pup and ST LMi, in which the accreting magnetic pole periodically passes behind the limb of the white dwarf) will allow detailed eclipse mapping of the accretion column and the shock oscillations to be carried out.

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