Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6474j&link_type=abstract
HST Proposal ID #6474
Other
Hst Proposal Id #6474 Hot Stars
Scientific paper
HE 1211-1707 was discovered in the Hamburg-ESO Quasar Surveyas a blue object, showing a very peculiar spectrum duringoptical follow-up spectroscopy with EFOSC at the 3.6 mTelescope at ESO in March 1993. Subsequent observations inJanuary 1994 and March 1995 showed very strong spectralvariations within 20 min. We interpret this variability asbeing due to a magnetic field on the surface of a rotatingwhite dwarf, having a relatively uniform magnetic field on onehemisphere and a much larger spread of field strengths visibleduring other phases of the rotational period. Unfortunately,all efforts have failed to determine approximate magneticfield strengths by comparison with sophisticated modelcalculations for hydrogen rich atmospheres and fieldstrengths below 1000 MG. Therefore, either helium is thedominating absorber or the object possesses the highestmagnetic field ever measured on the surface of a white dwarf.A UV spectrum would considerably help to set constraints tothe range of possible field strengths by measuring theposition of the blue shifted Lyman Alpha Sigma component, ifhydrogen is present in the atmosphere. Although HE 1211-1707is one of the hottest magnetic white dwarfs the relativefaintness of the star did not allow such an analysis with twoUV spectra taken with the IUE satellite, and an observationwith the HST is needed to understand this unique andmysterious object.
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