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YY Herculis-a New Eclipsing Symbiotic System
The indetermination of light curves behaviour of the symbiotic system YY
Her stimulated us to call an international photometric campaign for a
detailed coverage of its light curve. Our attention was oriented to
cover the period of the expected secondary minimum that was discovered
in 2001 tep{hr-hr2001}. The campaign was very successful; it covered
the secondary as well as primary minimum affected by a flare in about JD
2,452,440 that was later followed by an energetic outburst (JD
2,452,700). One possibility to explain the periodic variations of the
brightness of YY Her is the eclipsing model proposed by tet{hr-hr2003}.
Some spectroscopic behaviour still remains inconsistent with this model.
In the present work the energetic balances of the afore-mentioned events
are calculated and a model with a deformed (non-homogeneous) envelope,
surrounding the white dwarf is discussed.
This paper describes improved temporal resolution for three-dimensional (3D) continuous-wave electron paramagnetic resonance (EPR) imaging. To improve temporal resolution, the duration of magnetic filed scanning that is used to obtain an EPR spectrum for each projection was reduced to 40 ms. The Helmholtz coil pair for field scanning was driven by triangular waves. The uniform distribution of projections was also used to reduce the number of projections for 3D image reconstruction. The reduction reaction of 4-hydroxy-2,2,6,6-tetramethyl-piperidinooxy with ascorbic acid was visualized by improved 3D EPR imaging techniques with a temporal resolution of 5.8 s.
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