Photometric Search for variable stars in the field of two Northern open clusters, DOLIDGE 14 and NGC 1960

Abstract

The aim of present work is extract and analyses the light curves of the stars in the fields of two clusters, NGC 1960 and DOLIDZE 14. The photometric extraction is performed by comprehensive methodology of SSM via standard transformation and differential photometry using two comparison stars per candidate variable target. The resultant light curves for each possible variable star are displayed and their period analysis are performed via two different methods. The period and classification of 18 discovered short periodic type variable stars of NGC 1960 are discussed, which consist of four known variable stars and fourteen new variable stars. In the case of DOLIDZE 14, four discovered variables consist of one miscellaneous, one rotational, two binary type variable stars. In the case of NGC 1960, the 12 selected comparison stars seems to be possible candidate for long periodic variability and 4 stars may be standard stars. The variation in brightness of other twenty comparison stars is non-pulsating with irregular pattern. Membership analysis of variable stars are performed by using their distance, kinematic probability and location in (U−B) vs (B−V ) TCD. C-M diagrams were constructed to confirm the evolutionary state of the new variable stars.