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Dwarf Novae in the OGLE Data

Forty New Dwarf Novae in the OGLE-III Galactic Disk Fields

We report the discovery of 40 erupting cataclysmic variable stars in the OGLE-III Galactic disk fields: 17 objects of U Gem type, 19 of SU UMa type, and 4 of Z Cam type. Two of the new OGLE objects showed long-duration WZ Sge-like superoutbursts followed by a sequence of echo outbursts.

In the case of five SU UMa type stars we were able to estimate their supercycle lengths. They are in the range of 20-90 days, generally between the typical SU UMa type variables and a few objects classified as the ER UMa type variables. Since there is no significant difference between the two types but a higher mass-transfer rate resulting in more frequent outbursts and superoutbursts in the ER UMa type stars, we propose to discard this type as a separate class of variables.

Light curves and finding charts for the detected objects are available to the astronomical community from the OGLE Internet archive.

PLEASE cite the following paper when using the data or referring to these OGLE results:
Mrůz et al., 2013, Acta Astron., 63, 135 (arXiv:1307.1238)

Any comments about the data and the form of their presentation are welcome. Send your messages to this address.

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