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A NEW NON-PARAMETRIC APPROACH TO DETERMINE PROPER MOTIONS OF STAR CLUSTERS
PRIYATIKANTO, RHOROM,ARIFYANTO, MOCHAMAD IKBAL The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
The bulk motion of star clusters can be determined after careful membership analysis using parametric or non-parametric approaches. This study aims to implement non-parametric membership analysis based on Binned Kernel Density Estimators which takes into account measurements errors (simply called BKDE-e) to determine the average proper motion of each cluster. This method is applied to 178 selected star clusters with angular diameters less than 20 arcminutes. Proper motion data from UCAC4 are used for membership determination. Non-parametric analysis using BKDE-e successfully determined the average proper motion of 129 clusters, with good accuracy. Compared to COCD and NCOVOCC, there are 79 clusters with less than $3{\sigma}$ difference. Moreover, we are able to analyse the distribution of the member stars in vector point diagrams which is not always a normal distribution.
THE ANALYSIS OF A STAR CLUSTER FAMILY IN THE NORTHERN PART OF CARINA NEBULA
AYU, RAMADHANI PUTRI,PRIYATIKANTO, RHOROM,ARIFYANTO, M. IKBAL,ROMADHONIA, RISKA WAHYU,HILMI, MIFTAHUL,FITRIANA, ITSNA KHOIRUL,WULANDARI, HESTI R.T. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We studied a cluster family in the northern part of the Carina Nebula (NGC 3372) a group of clusters near NGC 3324 (Tr 15, NGC 3293, Loden 165, Loden 153 and IC 2581). We used data from UCAC4 to determine the cluster's membership and the near infrared CMDs of each cluster. We analyzed the spatial density and elongation as a function of radius for each cluster and found a possible interaction between NGC 3293 and Loden153. However, the shape distortion of NGC 3324 cannot be evaluated because of the inhomogenity in the coverage of UCAC4 in the east part of NGC 3324.