Abstract
We have performed spectroscopy and photometry of eclipses of the pre-cataclysmic variable UUSge using the 6-m telescope of the Special AstrophysicalObservatory and the 1.5-mRussian-Turkish telescope. Our analysis of variations of the B-V and V-R color indices during the eclipses indicates that the temperature of the secondary is T eff,2 = 6000−6300 K. A similar value, T eff,2 = 6200 ± 200 K, follows from our comparison of the observed spectrum of UU Sge at the total eclipse phase and theoretical spectra of late-type stars. We identify 27 absorption lines of 11 chemical elements in the secondary’s spectrum. Their abnormal intensities indicate possible high-velocity turbulent motions (up to ξ turb = 10.0 km/s) in the atmosphere of the star and the presence of hot gas above its surface.
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Original Russian Text © V.V. Shimansky, N.V. Borisov, I.F. Bikmaev, N.N. Shimanskaya, 2012, published in Astronomicheskii Zhurnal, 2012, Vol. 89, No. 6, pp. 508–514.
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Shimansky, V.V., Borisov, N.V., Bikmaev, I.F. et al. Observations of eclipses of UU Sge. Astron. Rep. 56, 456–462 (2012). https://doi.org/10.1134/S1063772912050046
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DOI: https://doi.org/10.1134/S1063772912050046