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

TL;DR

The paper reports initial results of the Tsessevich project aimed at locating the true coordinates of the historical eclipsing star YY Dra, and also discovers five new W UMa-type variable stars, providing their parameters for the GCVS.

Contribution

It introduces the Tsessevich project, details the methods and instruments used, and reports the discovery and parameter determination of five new variable stars.

Findings

First five new eclipsing W UMa-type variables identified

Confirmed parameters for these variables in the GCVS

Clarified the coordinates of YY Dra, distinguishing it from DO Dra

Abstract

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