Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6628b&link_type=abstract
HST Proposal ID #6628
Computer Science
Hst Proposal Id #6628 Hot Stars
Scientific paper
We propose to obtain high S/N GHRS spectra of the key He-richwhite dwarf RE J0503-289. These observations have twoprincipal aims. The first is to investigate the phenomenon ofmass loss in this star. Excluding planetary nebulae nuclei, REJ0503-289 is the only white dwarf in which evidence of ongoingmass loss has been observed with IUE. However, the reporteddetection is near the limit of the sensitivity of IUEpreventing study of the wind during its less intense periods.Mass loss may well be the missing ingredient in thetheoretical description of heavy element abundances in whitedwarfs. RE J0503-289 is the only known white dwarf where thiseffect can be studied as an on going phenomenon. The secondaim is to search for Fe and Ni in the photosphere of thisstar. The presence of these elements is required to explainthe large flux deficit observed in the EUV. Detailed models,including those elements so far detected (C, N, O and Si),substantially over predict EUV flux levels. RE J0503-289 isalso the only DO white dwarf for which a joint analysis of EUVand UV data will be possible and for which we can conduct adefinitive study of the composition and structure of thephotosphere.
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