English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present the first results of the project "Tsessevich". The main goal ofthis project is to find the real coordinates of eclipsing variable star YY Dra,which had been discovered by Tsessevich in 1934. However, the possible misprintin the coordinates entailed that the star had been lost and later identifiedwith a cataclysmic star DO Dra, which located closely to the publishedcoordinates of YY Dra. We expected, that search for YY Dra will give us somenew variable stars as a "by product". We plan to publish the results of thesearch as soon as the new variable stars would be confirmed. As the presentpaper is the first of the series of the papers about the results of thisproject, here we describe it's idea, used instruments, methods and computerprograms. Also we present the first five new eclipsing W UMa-type variablestars. They are already registered in the VSX catalog. For these systems we'vedetermined all parameters needed for the General Catalog of Variable Stars.

"Tsessevich" Project: an Attempt to Find the System YY Dra. I