UV Cyclotron Spectroscopy of the High- Field Polar UZ Fornacis

Details UV Cyclotron Spectroscopy of the High- Field Polar UZ Fornacis UV Cyclotron Spectroscopy of the High- Field Polar UZ Fornacis

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7396r&link_type=abstract

HST Proposal ID #7396

Physics

Hst Proposal Id #7396 Binary Stars

Scientific paper

UZ Fornacis is a high-field polar with 53 MG at the main accreting pole and 75 or 113 MG at the second pole. The system displays pronounced optical cyclotron line emission which increases in intensity towards the UV. UZ for ist ideally suited to derive the distribution of mass flow rates in the accretion spot on the white dwarfs in polars by a new method developed by us on the basis of our radiation-hydrodynamic calculations. We propose to take three spectra each with the STIS at the two orbital phases when the main accreting pole is in or out of view, respectively. This will allow us to determine {i} the area of the accretion spot, {ii} the distribution of the mass flow rates in the spot over a wide range from 10^-3 to 10 g,cm^-2s^-1, {iii} the temperature of the accreting white dwarf, and {iv} the field strength at the secondary high-field pole of UZ For {75 or 113 MG}. This information allows for the first time to model the internal structure of the accretion spot.

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