We propose to obtain high resolution (R~40000) high S/N (≳50) spectra for two dozens of so called yellow symbiotic systems using HRS spectrograph in MR mode. The aim of the proposal is to use HRS spectra for the radial velocity monitoring and to measure abundances of chemical elements. Radial velocities will be derived through cross-correlation technique. Abundances will be measured using the spectral synthesis employing the method of standard LTE analysis. We will also look for possible abundance anomalies due to, e.g., former mass transfer pollution. We expect to obtain new information about orbital parameters of these systems. Using it together with new Gaia DR2 distances we are going to revise and put new constraints on the physical parameters (temperature, luminosity, abundances) of these giants. It seems be very likely that these objects may turn out to have significantly larger diameters, and so be located at longer distances, be significantly colder and more luminous – the bright giants rather than a normal giants



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