Quasi-Periodic Oscillations in AM Herculis Binaries -- Cycle 3 Medium

Details Quasi-Periodic Oscillations in AM Herculis Binaries -- Cycle 3 Medium Quasi-Periodic Oscillations in AM Herculis Binaries -- Cycle 3 Medium

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4502c&link_type=abstract

HST Proposal ID #4502

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Hst Proposal Id #4502

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 sec. 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 UV and optical 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. This proposal is a followup to an accepted Cycle 2 program. We are proposing it for Cycle 3 in order to complete our survey of the most suitable AM Her systems during this last opportunity for HSP observations.

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