Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5305l&link_type=abstract
HST Proposal ID #5305
Physics
Hst Proposal Id #5305 Hot Stars Subdwarfs
Scientific paper
Hot evolved subdwarfs are the immediate progenitors of white dwarfs, and are therefore of great importance for our understanding of the late stages of stellar evolution. Recently, significant abundances of heavy metals have been found in some hot DA white dwarfs, formely thought of having hydrogen-pure atmospheres. Iron and nickel now appear to be the major opacity sources in the FUV and EUV spectrum of these white dwarfs as well as in the hot evolved sdO subdwarfs. We will observe one sdO stars to redetermine most accurately its stellar parameters. We will analyze the spectrum using our new most sophisticated NLTE line-blanketed model atmospheres, including the blanketing of tens of thousands of Fe IV, Fe V, Fe VI, Ni IV and Ni V lines. We will derive consistently the abundances of the iron-peak elements. Contrary to the abundances of light elements which are primarily signatures of nucleosynthetic processes, the iron-peak elements may shed light on the relative importance of the individual mixing processes in the photospheres of sdO stars, and give us a better insight on the connection between these subdwarfs and the white dwarfs.
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