The determination of white dwarf parameters in dwarf novae by optical spectral modeling

This paper presents the results of a model analysis of optical spectra and determination of the parameters of three individual SU UMa and WZ Sge type dwarf novae. The moderate resolution spectra of TY Psc, FL Psc and V455 And were obtained at the 6-m BTA of the SAO RAS in the low state of these syst...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2021-08, Vol.21 (7), p.158-40
Main Authors: Andreevna Dudnik, Anastasiya, Alekseevna Mitrofanova, Arina, Vladimirovich Shimansky, Vladislav, Vladimirovich Borisov, Nikolay, Abdullovich Sakhibullin, Nail
Format: Article
Language:English
Subjects:
Atmosphere
Atmospheric models
Dwarf novae
Hydrogen
Modelling
Novae
Parameters
Radiation
Spectra
stars: individual: FL Psc
stars: individual: TY Psc
stars: individual: V455 And
stars: variables: dwarf novae
Stellar atmospheres
techniques: spectroscopic
White dwarf stars
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Summary:This paper presents the results of a model analysis of optical spectra and determination of the parameters of three individual SU UMa and WZ Sge type dwarf novae. The moderate resolution spectra of TY Psc, FL Psc and V455 And were obtained at the 6-m BTA of the SAO RAS in the low state of these systems with the determination of white dwarf radiation. The theoretical spectra were calculated using the grid models of hydrogen dwarf atmospheres of white dwarfs by varying the parameters ( T eff and log g ) to reach the best agreement with the observed ones. We highlight different effects of the parameters on the shape and intensity of the HI lines. Therefore, it is possible to unambiguously determine T eff and log g from the analysis of observations. The fundamental parameters of white dwarfs ( M and R ) were found by comparing the parameters of atmospheres with theoretical models of the internal structure. The obtained parameters of the primaries of TY Psc, FL Psc and V455 And are consistent with the average values for SU UMa and WZ Sge systems. As a result, we demonstrate the efficiency of the method for determining the parameters of such systems based on the analysis of a limited set of observed optical spectra.
ISSN:1674-4527
DOI:10.1088/1674-4527/21/7/158