Photometric, kinematic, and variability study in the Galactic open clusters
Date & Time :
Auditorium & Zoom
We carried out the photometric and kinematic study of 10 open clusters using UBVRcIc data, near-IR data from 2MASS, Gaia data to accomplish our objectives. The average distances to the clusters were determined using Gaia parallaxes. The log(Age) values of these clusters are determined by fitting isochrone on the colour-magnitude diagrams of the clusters. The colour-magnitude diagram of NGC 2360 and SAI 45 hosts extended main-sequence turn-off which is found to be mainly caused by different rotation rates of stars. We found two-step mass function slopes for the open clusters NGC 381 and SAI 45. We calculated relaxation time values and found early mass segregation in IC 1442 caused by rapid dynamical evolution occurring even in very young clusters. We also carried out long-term observation for variability analysis in NGC 1960, NGC 559, and NGC 381. We found a total of 76, 70, and 57 variable stars after light curve inspection of the stars in the region of clusters NGC 1960, NGC 559, and NGC 381, respectively. We characterized the periodic variable based on period, amplitude, the shape of the light curve, and location on the H-R diagram. The variability analysis in the thesis will enable us to understand intrinsic properties like different modes of pulsation mechanism and spurious activities as well as extrinsic properties like the distribution of cool spots and binary systems.
About Speaker :
The Speaker is an SRF at ARIES and this is his thesis-submission talk.