Peremennye Zvezdy", . ... Received: 7.09.2013; accepted: 10.03.2015 . ... There were two different systems used to acquire the data (a): A TheImagingSource DMK 41BU02 Astronomy camera on an unfiltered 110mm focal length f/2.5 lens, mounted on a Meade ETX-60 operating in Alt/Az mode and (b) : A TheImagingSource DMK 41AU02.AS Astronomy Camera on an unfiltered 50mm focal length f/2 lens mounted on a Meade ETX-90 operating in Equatorial Mode. ... System (a) was used in 2010, (b) was used in 2011 and 2013. ...