Flare Activity and an Optical Superflare of the X-ray Object 1RXS J220111+281849

Astronomy and Astrophysics – Astronomy

Scientific paper

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X-Ray And Gamma-Ray Sources

Scientific paper

A UBVR monitoring of the X-ray source 1RXS J220111+281849 was performed during August 2-21, 1999. Seven moderately intense ultraviolet flares with 1-3 mag amplitudes were detected. The object exhibits both rapid and slow flares. An unusual superintense flare with an 11.0 mag 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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