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Title:
The field structure of the most strongly magnetized white dwarf PG1031+234
Authors:
Jordan, Stefan
Publication:
HST Proposal ID #9893
Publication Date:
07/2003
Origin:
HST
Keywords:
HST Proposal ID #9893 HOT STARS
Bibliographic Code:
2003hst..prop.9893J

Abstract

With a maximum field strength of 1 GG PG1031+234 has the strongest magnetic field found in any white dwarf. Since magnetic fields generated on earth are limited to a few MG, this star is an important cosmic laboratory to test the atomic data calculated for field strengths which are similar to those in recyled millisecond pulsars. Our aim is to take phase resolved FUV spectra covering the rotational {spin} period of 204 minutes. The variation of the position and shape of the Lyman alpha components is very important for a detailed mapping of magnetic field topology, which is believed - according to an analysis of the optical data - to consist of a general dipole field with a polar field strength of 500 MG and a magnetic spot with a field reaching 1 GG. Moreover, we will search for the forbidden 1s0 -> 2s0 transition of hydrogen which would indicate the additional presence of an electric field, and, for quasi-molecular features of hydrogen which would provide constraints on the detailed temperature structure of the atmosphere. It is also important to redetermine the effective temperature with time resolved UV data, since an inconsistency between the analysis of IUE spectrum {Teff approx. 25000 K}, integrated over one full rotational period, and the optical spectrum {15000 K} exists which is also reflected in a large uncertainty of the mass determination.
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