• Photometric and kinematical analysis of Koposov 12 and Koposov 43 open clusters

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    • Keywords

       

      Open clusters: Koposov 12 (FSR 802) and Koposov 43 (FSR 848); PPMXL and Gaia DR2; photometry: color-magnitude diagrams; stars: luminosity and mass functions; kinematics: dynamical evolution, velocity ellipsoid parameters.

    • Abstract

       

      We present a photometric and kinematical analysis of two poorly studied open clusters, Koposov 12 (FSR 802) and Koposov 43 (FSR 848), by using cross-matched data from PPMXL and Gaia DR2 catalogs. We used astrometric parameters to identify 285 and 310 cluster members for Koposov 12 and Koposov 43, respectively. Using the extracted member candidates and isochrone fitting to near-infrared ($J, H$, and $K_s$) and Gaia DR2 bands ($G, G_{BP}$, and $G_{RP}$), and color-magnitude diagrams (CMDs), we have estimated ages: $\log({\rm age} \ {\rm yr}^{-1}) = 9.00 \pm 0.20$ and $9.50 \pm 0.20$ and distances $d = 1850 \pm 43$ and $2500 \pm 50$ pc for Koposov 12 and Koposov 43, respectively, assuming solar metallicity ($Z = 0.019$). The estimated masses of the cluster derived using the initial mass function and synthetic (CMD) are $364 \pm 19$ and $352\pm 19 \ M_{\odot}$, respectively. We have also computed their velocity ellipsoid parameters based on ($3\times 3$) matrix elements ($\mu_{ij}$).

    • Author Affiliations

       

      W. H. ELSANHOURY1 2

      1. Physics Department, Faculty of Science and Arts, Northern Border University, Rafha Branch, Saudi Arabia.
      2. Astronomy Department, National Research Institute of Astronomy and Geophysics (NRIAG), 11421 Helwan, Cairo, Egypt.
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