Physics – Optics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4401s&link_type=abstract
HST Proposal ID #4401
Physics
Optics
Hst Proposal Id #4401
Scientific paper
We propose to obtain spectropolarimetric observations of the unique magnetic white dwarf GD229, which exhibits numerous, strong unidentified features in the ultraviolet and optical spectrum. It has a very high but unknown magnetic field strength and an unknown atmospheric composition. Accurate UV spectro- polarimetry is critical to determining the parameters of this star for several reasons: (1) It should yield a rough estimate of the field strength based on the behavior of the ratio of circular to linear polarization at the shorter wavelengths. (2) We will search for the well-defined Lyman alpha sigma plus component, from a possible trace hydrogen abundance, which could also reveal the field strength and geometry. (3) The high quality spectrum will yield a wealth of detailed UV features subject to future analysis using calculations of Zeeman splitting of heavier ions in the presence of the order 10^9 gauss magnetic fields. This observation may not be possible after installation of the COSTAR optics.
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