Refined Parameters of the Pre-Cataclysmic Variable with the sdB Sub-Dwarf SDSS J162256.6+473051

Abstract

In this paper, we present results of refining the characteristics of the eclipsing pre-cataclysmic variable SDSS J162256.6+473051 based on a model analysis of its optical radiation. We used the spectra of the system obtained with the 6-m BTA telescope of SAO RAS and the data from its multi-band photometric observations with the 1.5-m Russian-Turkish telescope RTT150. Calculations of the optical radiation of SDSS J162256.6+473051 were carried out using the method of irradiated atmosphere models. When analyzing the spectra of the system at the minimum brightness, we found the following atmospheric parameter estimates of the sdB sub-dwarf: ${{T}_{{{\text{eff}}}}} = 30{\kern 1pt} 900 \pm 700$ K, $\log {\kern 1pt} g = 5.85 \pm 0.12$, [He/H] $= - 0.57 \pm 0.05$. The light curves of SDSS J162256.6+473051 were modeled and a complete set of fundamental parameters of the system was obtained. Their satisfactory agreement with the literature data allows us to conclude that the characteristics of similar systems with weak reflection effects can be analyzed together, even when they are determined using different methods of radiation modeling.