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Photometric and Hα Observations of the Cataclysmic Star UX UMa

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Abstract

UBVRI photometry and spectroscopic observations around the Hα line of the cataclysmic star UX UMa are presented. The analysis of the 9-year photometry shows that the out-of-eclipse brightness of the system and the depth of the eclipse changes in different time scales while the width of the eclipse remains constant. The observed features of the light curves as well as the features of the two-peaked Hα profiles were attributed to an inhomogeneity of the accretion disk. “Spiral arm” model for a fitting of the light curves of UX UMa is proposed. It reproduces well the observational data. The obtained azimuthal extent of the spiral arms is of ∼90° and their light contribution is about 17–30of the total V flux of the disk. The obtained two dense structures at the outer disk covering partially the inner hot disk and the white dwarf at orbital phases ∼0.7 and ∼0.2 is in agreement with the predictions of the theoretical computations.

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Authors and Affiliations

  1. Department of Physics, Shumen University, 115 Universitetska Str., 9700, Shumen, Bulgaria

    Diana Kjurkchieva & Dragomir Marchev

  2. Sternberg Astronomical Institute, Universitetski pr. 13, Moscow, 119992, Russia

    Tatiana Khruzina

  3. Astronomical observatory, Volgina 7, 11160, Belgrade, Serbia and Montenegro

    Gojko Djurašević

Authors
  1. Diana Kjurkchieva
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  2. Dragomir Marchev
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  3. Tatiana Khruzina
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  4. Gojko Djurašević
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Correspondence to Tatiana Khruzina.

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Kjurkchieva, D., Marchev, D., Khruzina, T. et al. Photometric and Hα Observations of the Cataclysmic Star UX UMa. Astrophys Space Sci 306, 217–229 (2006). https://doi.org/10.1007/s10509-006-9253-2

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  • DOI: https://doi.org/10.1007/s10509-006-9253-2

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