Search for long-term periodicity in the Pleiades active dwarf stars from photographic sky surveys

Astronomy and Astrophysics – Astronomy

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Pleiades, Active Dwarfs, Periodicities, Photographic Sky Surveys

Scientific paper

A program for searching for long-term periodicity of the Pleiades active dwarf stars is presented. As a basis the Pleiades flare stars (or UV Cet type stars) from the Flare Stars Database, which are identified in the USNO A2.0 catalogue are used. The investigation for long-term variability will be made by the usage of European astronomical plate archives, included in the Wide-Field Plate Database (http://www.skyarchive.org), whose time distribution covers more than 100 years. Among these plate archives are those of Rozhen Observatory (Bulgaria), Konkoly Observatory (Hungary), Byurakan (Armenia), Potsdam (Germany), Royal Observatory of Edinburgh (UK), Bamberg (Germany), etc. Limited number of the existing plates in the Pleiades region are already digitized with different scaning machines as PDS 1010 (Sofia), PDS 2020 (Muenster), SUPER COSMOS (Edinburgh) and some flatbed scanners.

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