Author:
Zuzana Carikova

Title:
Formation of neutral disk-like zone around the active hot stars in
symbiotic binaries

Abstract:
During active phases the ionization structure in symbiotic binaries
changes significantly. In the systems with high orbital inclination we
observe a two-temperature-type of the UV spectrum. The cooler component is
produced by a relatively warm stellar source, while the hotter one is
represented by the highly ionized emission lines and a strong nebular
continuum. This situation suggests the presence of a neutral disk-like
structure surrounding the accretor in the orbital plane and hot emitting
regions located above/below the disk. A rapid creation of such the
ionization structure during the first days/weeks of outbursts is connected
with the enhanced hot star wind. Due to a fast rotation of the accretor,
the wind particles are compressed more to the equatorial plane, where
create a neutral zone in the form of a flared disk. We tested the latter
by applying the wind compression model. The presence of such disks is
transient, being connected with the active phases of symbiotic binaries.