Flare activity and an optical superflare of the X-ray object 1RXS J220111+281849 |
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| Authors: | V M Batyrshinova M A Ibragimov |
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| Institution: | (1) Ulugbek Astronomical Institute, Academy of Sciences of Uzbekistan, Astronomicheskaya ul. 33, Tashkent, 700052, Uzbekistan |
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| Abstract: | A UBVR monitoring of the X-ray source 1RXS J220111+281849 was performed during August 2–21, 1999. Seven moderately intense ultraviolet flares with 1–3m amplitudes were detected. The object exhibits both rapid and slow flares. An unusual superintense flare with an $11\mathop .\limits^m 0$ amplitude in U was detected on August 18, 1999. Light curves of the flares are presented, and their physical parameters are briefly analyzed. |
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| Keywords: | X-ray and gamma-ray sources |
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