The Origin of the Ultra-Violet Spectral Components in the Polar-Like Intermediate Polar, RE075 Cycle 4 High

Details The Origin of the Ultra-Violet Spectral Components in the Polar-Like Intermediate Polar, RE075 Cycle 4 High The Origin of the Ultra-Violet Spectral Components in the Polar-Like Intermediate Polar, RE075 Cycle 4 High

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5418r&link_type=abstract

HST Proposal ID #5418

Physics

Hst Proposal Id #5418 Hot Stars Eruptive Binaries

Scientific paper

RE0751+14, is arguably the most important magnetic cataclysmic variable (CV) to be discovered for many years. Although it is undoubtedly an intermediate polar, it also exhibits highly unusual properties (e.g. a strong EUV component, modulated optical/IR polarization, X-ray, optical and IR dips in its rotational light curve and a very red rotational pulsation) which strongly suggest that its white dwarf possesses a powerful magnetic field, similar to that associated with the strongly magnetic (B>10MG) polars. Thus RE0751+14 is apparently an interloper, occupying a new, uncharted domain in the field distribution of the magnetic CVs which was previously thought to be bimodal. The study of RE0751+14 is therefore of fundamental importance to our knowledge of the field distribution in magnetic CVs and consequently of their evolutionary relationship. The UV waveband is crucial to this study because magnetic disruption and control of the accretion flow occurs at radii where the hot UV emitting material exists. We are proposing to use the HST FOS to secure the first highly time-resolved UV spectroscopy of RE0751+14. These will enable us, for the first time, to a) segregate the different UV continuum components (via their different temporal behaviour) and characterize their sources and b) measure the emission line flux variations to probe physical structure within the system. These observations will be complemented by a parallel HRS proposal to study the CIV line in detail.

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