Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-07-12
Acta Astron. 61, 2011, 123-138
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
16 pages, 10 figures
Scientific paper
We report serendipitous discovery of three new dwarf novae which eruptions in 2010 were observed by the ongoing microlensing survey OGLE-IV. All three objects are located in the Galactic bulge fields observed with the highest cadence of 20 minutes. In the OGLE-III and OGLE-IV data we revealed a total of 23 outbursts for one of the stars. What makes this object most interesting is the derived superhump period of 2.61 h placing it in the orbital period gap. The superhump period changed during the superoutburst with a very short timescale. For two other objects, for which we observed outburst, the orbital periods of 5.4 h and 9.5 h were measured in the quiescence.
Kozłowski Szymon
Kubiak Mateo M. M.
Pietrukowicz Pawel
Pietrzynski Grzegorz
Poleski Radoslaw
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