Symbiotic Binaries: Nature of the Hot Components Derived from UV Absorption SPECTRA-CYC3

Details Symbiotic Binaries: Nature of the Hot Components Derived from UV Absorption SPECTRA-CYC3 Symbiotic Binaries: Nature of the Hot Components Derived from UV Absorption SPECTRA-CYC3

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4520p&link_type=abstract

HST Proposal ID #4520

Computer Science

Hst Proposal Id #4520

Scientific paper

We propose to obtain high S/N ultraviolet spectra of 3 symbiotic stars with the FOS spectrograph in the spectral region 1150 - 2311 A. It is essential to obtain good flux in the continuum level and line profiles of the absorption lines. These spectra should decide the nature of the hot components of the symbiotic systems, which are responsible for the ionization and excitation of the circumstellar/circumbinary nebular material. Previous investigations, based either on continuum fitting by means of simple LTE models, or on Zanstra temperatures derived from the nebular emission lines using blackbody emitters, were unable to distinguish with certainty between three possible ionizing sources:(1) a hot subdwarf similar to a central star of a planetary nebula, (2) a degenerate white dwarf, possibly with an accretion disk, (3) a main-sequence star surrounded by a fairly hot accretion disk. We will use Hubeny's comprehensive computer programs for both non-LTE stellar atmospheres of hot objects and for non-LTE accretion disks. Continuous circumstellar emission will also be incorporated. We realize that FOS does not offer the ideal resolution, but Hubeny's synthetic spectrum programs allow convolutions that can mimic the observed FOS spectra. We expect to decide between the three alternative models and also find out if NLTE models are preferable to BB for the Zanstra technique.

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