KFU. Card publication. Determination of QWSer and QZ Lib parameters from optical spectra

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FEDERAL UNIVERSITY

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DETERMINATION OF QWSER AND QZ LIB PARAMETERS FROM OPTICAL SPECTRA

Form of presentation

Articles in international journals and collections

Year of publication

2022

Язык

английский

Authors, employees of KFU

Shimanskiy Vladislav Vladimirovich, author

Bibliographic description in the original language

Dudnik A.A. Determination of QWSer and QZ Lib parameters from optical spectra [Text] / A.A. Dudnik, V.V. Shimansky, N.V. Borisov, N.A. Sakhibullin, M.M. Gabdeev // Acta Astrophysica Taurica. - 2022. - Vol.3. - P.12-16.

Annotation

The paper investigates a new technique for determining dwarf nova parameters based on the analysis of their optical spectra with a signal-to-noise ratio S/N 80. We have determined parameters for the QW Ser and QZ Lib systems related to the SU UMa and WZ Sge dwarf novae. Moderate resolution spectra of both systems were obtained at BTA SAO during their low state with an optically thin accretion disk and the dominance of white dwarf radiation. As a result of the model analysis of the spectra, the parameters of the accretor atmosphere of QW Ser (𝑇eff = 23500 400 K and log 𝑔 = 8?36 0?05 dex) and constraints on the parameters for QZ Lib (𝑇eff = 9500 300 K and log 𝑔 ¡ 8?55 dex) were found. The presence of moderate noise in the studied spectra is not shown to affect the accuracy of determining parameters. The low temperature of the white dwarf does not allow to obtain a correct estimate of its surface gravity. Based on the determined parameters of the accretor atmospheres, a complete set of QW Ser parameters and estimates of QZ Lib parameters were found. The secondary components of both systems are defined to be red dwarfs of spectral type M.

Keywords

Cataclysmic variables, dwarf novae, white dwarfs, optical spectra

The name of the journal

Acta Astrophysica Taurica

URL

https://www.astrophysicatauricum.org/index.php/aat/article/view/25/26

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=265999&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Shimanskiy Vladislav Vladimirovich	ru_RU
dc.date.accessioned	2022-01-01T00:00:00Z	ru_RU
dc.date.available	2022-01-01T00:00:00Z	ru_RU
dc.date.issued	2022	ru_RU
dc.identifier.citation	Dudnik A.A. Determination of QWSer and QZ Lib parameters from optical spectra [Text] / A.A. Dudnik, V.V. Shimansky, N.V. Borisov, N.A. Sakhibullin, M.M. Gabdeev // Acta Astrophysica Taurica. - 2022. - Vol.3. - P.12-16.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=265999&p_lang=2	ru_RU
dc.description.abstract	Acta Astrophysica Taurica	ru_RU
dc.description.abstract	The paper investigates a new technique for determining dwarf nova parameters based on the analysis of their optical spectra with a signal-to-noise ratio S/N 80. We have determined parameters for the QW Ser and QZ Lib systems related to the SU UMa and WZ Sge dwarf novae. Moderate resolution spectra of both systems were obtained at BTA SAO during their low state with an optically thin accretion disk and the dominance of white dwarf radiation. As a result of the model analysis of the spectra, the parameters of the accretor atmosphere of QW Ser (𝑇eff = 23500 400 K and log 𝑔 = 8?36 0?05 dex) and constraints on the parameters for QZ Lib (𝑇eff = 9500 300 K and log 𝑔 ¡ 8?55 dex) were found. The presence of moderate noise in the studied spectra is not shown to affect the accuracy of determining parameters. The low temperature of the white dwarf does not allow to obtain a correct estimate of its surface gravity. Based on the determined parameters of the accretor atmospheres, a complete set of QW Ser parameters and estimates of QZ Lib parameters were found. The secondary components of both systems are defined to be red dwarfs of spectral type M.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Cataclysmic variables	ru_RU
dc.subject	dwarf novae	ru_RU
dc.subject	white dwarfs	ru_RU
dc.subject	optical spectra	ru_RU
dc.title	Determination of QWSer and QZ Lib parameters from optical spectra	ru_RU
dc.type	Articles in international journals and collections	ru_RU