Double Degenerates Among DAO White Dwarfs

Details Double Degenerates Among DAO White Dwarfs Double Degenerates Among DAO White Dwarfs

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8329b&link_type=abstract

HST Proposal ID #8329

Computer Science

Hst Proposal Id #8329 Binary Stars

Scientific paper

The evolution of DAO white dwarfs, which have hybrid spectra showing both hydrogen and helium lines, is not well understood. It appears that they may be a rather disparate collection of objects with a variety of different origins. For example, it was recently discovered that one of these stars {Feige 55} lies in a close double degenerate system, and must therefore have undergone mass transfer and common envelope evolution. We propose to obtain STIS/FUV spectra of two problematic DAOs, GD561 and PG 1210+533, to determine whether they are also the product of binary evolution. Circumstantial evidence exists to suggest that both stars possess unresolved degenerate companions. However, ground based observations to search for radial velocity variations have proved inconclusive, since the H Balmer lines in these hot stars {50, 000K

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