UV Zeeman spectroscopy of AM Herculis

Details UV Zeeman spectroscopy of AM Herculis UV Zeeman spectroscopy of AM Herculis

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9635g&link_type=abstract

HST Proposal ID #9635

Physics

Hst Proposal Id #9635

Scientific paper

AM Herculis, the brightest strongly magnetic cataclysmic variable, entered in December 2001 an extended state of low accretion activity. During such low states, the magnetic white dwarf totally dominates the ultraviolet emission of the system, and only then an in-depth study of its photospheric properties becomes feasible. We propose to obtain an exploratory HST/STIS observation of the magnetic white dwarf in AM Herculis. We will use these data to measure for the first time the Zeeman splittings of metal {C, N, O, Si} resonance lines in a magnetic field that is far beyond the reach of any terrestrial laboratory {B=14MG}. These observations will provide fundamental experimental input that should enable significant progress of our understanding of the behaviour of matter in strong magnetic fields. Four HST orbits will be sufficient to map both the abundance and temperature variation over the surface of the WD.

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