Main Article Content

Anastasiya Dudnik
Vladislav Shimansky
Nikolay Borisov
Nail Sakhbullin
Maxim Gabdeev


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.


Download data is not yet available.

Article Details

How to Cite
Dudnik A., Shimansky V., Borisov N., et al., 2021. Acta Astrophysica Taurica, vols. 3, no. 1, pp. 12–16. DOI: 10.31059/aat.vol3.iss1.pp12-16
Magnetism and activity of the Sun and stars – 2021 Conference proceedings


Afanasyev V.L., Moiseev A.V., 2005. Astron. Lett., vol. 31, no. 3, pp. 194–204.

Anders E., Grevesse N., 1989., Geochimica et Cosmochimica Acta, vol. 53, pp. 197–214.

Baraffe I., Chabrier G., Barman T.S., et al., 2003. Astron. Astrophys., vol. 402, pp. 701–712.

Dudnik A.A., Mitrofanova A.A., Shimansky V.V., 2021. Res. Astron. Astrophys., no. 21, id. 158.

Eggleton P.P., 1983. Astrophys. J., vol. 268, pp. 368–369.

Girardi L., Bressan A., Bertelli G., Chiosi C., 2000. Astron. Astrophys. Suppl. Ser., vol. 141, pp. 371–383.

Guillaume D., Otulakowska-Hypka M., 2018. Astron. Astrophys., vol. 617, no. 26, pp. 1–14.

Kato T., Uemura M., 1999. Information Bulletin on Variable Stars, no. 4802, pp. 1–2.

Kato T., Hambsch F-J., Maehara H., 2014. Astron. Soc. Japan, vol. 66, pp. 1–30.

Katysheva N., Shugarov S., Borisov N., et al., 2015. Acta Polytechnica CTU Proceedings, no. 2. pp. 123–127.

Menzhevitski V.S., Shimanskaya N.N., Shimansky V.V., Kudryavtsev D.O., 2014. Astrophys. Bull., vol. 69, pp. 180.

Mitrofanova A.A., Borisov N.V., Shimansky V.V., 2014. Astrophys. Bull., vol. 69, no. 1, pp. 88–101.

Mitrofanova A.A., 2019. The investigation of different types of close binary systems based on the modeling of their optical radiation (PhD). KFU, pp. 123–127.

Nogami D., Uemura M., Iwamatsh H., 2004. Publ. Astron. Soc. Pacific, no. 56, pp. 99–107.

Pala A.F., Gansicke B.T., Townsley D., 2017. Mon. Not. Roy. Astron. Soc., vol. 466, pp. 2855–2878.

Pala A.F., Schmidtobreicky L., Tappert C., 2018. Mon. Not. Roy. Astron. Soc., vol. 481, pp. 2523–2535.

Panei J.A., AlthausL.G. , Benvenuto O.G., 2000. Astron. Astrophys., vol. 353, pp. 970–977.

Patterson J., Thorstensen J.R., Kemp J., 2003. Publ. Astron. Soc. Pacific, no. 115, pp. 1308–1329.

Patterson J., Thorstensen J.R., Kemp J., 2005. Publ. Astron. Soc. Pacific, vol. 117, pp. 427–444.

Piskunov N.E., 1992. In Glagolevskij Yu.V. and Romanyuk I.I. (Eds.), Physics and evolution of stars, Proc. Sankt Petersburg: NAUKA, p. 92.

Ritter H., Kolb U., 2011. VizieR Online Data Catalog, B/cb.

Schmidtobreick L., Galli L., Whiting A., 2004. IAU Inform. Bull. Var. Stars, no. 5508, pp. 1–4.

Szkody P., Anjum S.M., Boris T.G., 2013. Astrophys. J., vol. 775, pp. 1–4.

Takamizawa K., 1998. VSOLJ Variable Star Bulletin, no. 3, pp. 30–31.

Uemura M., Kato T., Nogami D., 2010. Publ. Astron. Soc. Japan, vol. 62, pp. 613–620.

Voges W., Aschenbach B, Boller T., Brauninger H., 2000. IAU Circ., no. 7432.

Zorotovic M., Schreiber M.R., Parsons S.G., 2014. Astron. Astrophys., no. 24430, pp. 1–5.