Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6714g&link_type=abstract
HST Proposal ID #6714
Computer Science
Hst Proposal Id #6714 Binaries And Star Fo
Scientific paper
Mass transfer during the evolution of intermediate-mass starsin a close binary system can result in a rejuvenated and spun-up secondary star which can appear as a rapidly rotating Bestar. Models suggest that many bright Be stars may bebinaries with unseen, stripped-down, helium star companions.One of the best candidates for such systems is the long periodbinaries Phi Per (127 d). We have recently used the Doppler tomographyalgorithm with IUE high dispersion spectra to reconstruct theindividual spectra of the Phi Per system, and we find a weaksecondary spectrum that resembles that of a hot subdwarf.Here we propose to obtain high S/N ratio spectra of thisbinaries with the GHRS at 3 orbital phases with differingorbital Doppler shifts. These spectra will allow us to detectand measure directly the secondary's weak spectral lines inthe composite spectrum, which in turn will provide estimatesof the mass ratio, the UV intensity ratio, and secondaryprojected rotational velocity. By combining results from all3 spectra, we can reconstruct a higher S/N spectrum of thesecondary star alone, which will help determine thetemperature, gravity, and chemical abundance of the companion.This program will provide fundamental data on the nature ofthe stripped-down companion, and will yield the first directdetection of a binary that fills the evolutionary gap betweensystems of massive main sequence stars and the Be/X-raybinaries.
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