Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5322w&link_type=abstract
HST Proposal ID #5322
Computer Science
Hst Proposal Id #5322 Hot Stars White Dwarfs
Scientific paper
We propose GHRS observations of two exceptional (pre-) white dwarf stars that uniquely show prominent ultrahigh-ionisation lines of OVIII. The origin of these spectral features is completely unknown. Although the two stars represent the hottest objects within their spectral subclass, a photospheric origin of these emission features is clearly excluded. It is suspected that a corona can be responsible for this phenomenon, and we propose observations that can proof this hypothesis. The first object is KPD0005+5106, the hottest helium rich white dwarf known so far (Teff=120kK). It would be the first detection of a corona around a white dwarf. The spectral analysis of HST data will also help to remove discrepancies between observed C and N abundances and predictions of diffusion/radiative levitation theory. The second object is RXJ2117.1+3412, the hottest PG1159 type central star of a PN. HST observations of this non-radial pulsator will also constrain the edge of the GW Vir instability strip at the high-luminosity limit.
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