The Accreting Magnetic White Dwarf in AM HER. Heating, Chemical Composition and Mass

Details The Accreting Magnetic White Dwarf in AM HER. Heating, Chemical Composition and Mass The Accreting Magnetic White Dwarf in AM HER. Heating, Chemical Composition and Mass

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6558b&link_type=abstract

HST Proposal ID #6558

Physics

Hst Proposal Id #6558 Binaries And Star Fo

Scientific paper

AM Herculis is the UV-brightest object of its class and,therefore, offers a unique possibility to probe the physics ofaccretion onto magnetic compact objects with unprecedenteddetail. Using the sensitivity, velocity, and time resolutionof the GHRS, we will (a) determine the fractional area of theaccretion region on the white dwarf and the thermal responseof the white dwarf to accretion-induced heating (e.g. thelateral and vertical (depth) extent of the heating); (b)determine metal abundances in the accretion-enriched white-dwarf atmosphere for the first time; (c) measure the white-dwarf mass from the radial-velocity curve; and (d) reconstructthe accretion-stream geometry from the radial velocities ofthe high-excitation emission lines. The proposed HSTobservations are cornerstones of a major HST/ROSAT/IUE/opticalcampaign devoted to AM Herculis which lasts from February toOctober 1996.

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