Computer Science
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10209r&link_type=abstract
HST Proposal ID #10209
Computer Science
Hst Proposal Id #10209 Hot Stars
Scientific paper
We propose UV spectroscopy of the four unique post-AGB stars of spectral type O{He} in order to understand the origin of their peculiar surface abundances. These stars are the only known amongst the hottest post-AGB stars {effective temperatures > 100, 000 K} whose atmospheres are composed of almost pure helium. This chemistry markedly differs from that of the hydrogen-deficient post-AGB evolutionary sequence with objects which have carbon dominated atmospheres {PG1159 stars and Wolf-Rayet central stars}. While PG1159 and Wolf-Rayet stars are the result of a late helium-shell flash, this scenario cannot explain the O{He} stars. Instead, they are possibly double-degenerate mergers. We speculate that the four O{He} stars represent evolved RCrB stars, which also have helium dominated atmospheres. We aim to determine the C, N, O, and Si abundances precisely, in order to proof this evolutionary link.
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