Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7753b&link_type=abstract
HST Proposal ID #7753
Other
Hst Proposal Id #7753 Binary Stars
Scientific paper
In 1980 McClure et al.{ApJ 238, L35} discovered that all Ba stars show radial velocity variations indicative of their binary nature. These authors already suspected that the companions are white dwarfs. White dwarf companions were indeed detected for the Ba star zeta Cap and the mild Ba star zeta Cyg {Boehm-Vitense 1980, ApJ 239, L79} by means of IUE observations. Evidence for a high temperature radiation field was seen in the spectra of the mild Ba stars HR1016, 16Ser and 56UMa. If present, the white dwarf companions are too faint to be seen with IUE. We would like to look for them now with HST. It seems to us to be very important to check whether indeed all Ba stars have white dwarf companions. If so this makes it highly probable that the peculiar abundances are due to mass transfer from a very luminous companion to the present Ba star. After losing its envelope the luminous companion was left as the present white dwarf. This opens up the possibility that other peculiar abundances seen in other peculiar stars like the CH stars or perhaps also the weak G band stars might also be due to mass transfer. On the other hand if the white dwarfs are not found for all Ba stars we may have to look for other processes, that could bring to the surface of these stars material which has experienced the slow neutron capture process.
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