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CCD UBV photometric study of five open clusters—Dolidze 36, NGC 6728, NGC 6800, NGC 7209, and Platais 1

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Abstract

In this study, we present CCD UBV photometry of poorly studied open star clusters, Dolidze 36, NGC 6728, NGC 6800, NGC 7209, and Platais 1, located in the first and second Galactic quadrants. Observations were obtained with T100, the 1-m telescope of the TÜBİTAK National Observatory. Using photometric data, we determined several astrophysical parameters such as reddening, distance, metallicity and ages and from them, initial mass functions, integrated magnitudes and colours. We took into account the proper motions of the observed stars to calculate the membership probabilities. The colour excesses and metallicities were determined independently using two-colour diagrams. After obtaining the colour excesses of the clusters Dolidze 36, NGC 6728, NGC 6800, NGC 7209, and Platais 1 as \(0.19\pm0.06\), \(0.15\pm0.05\), \(0.32\pm0.05\), \(0.12\pm 0.04\), and \(0.43\pm0.06\) mag, respectively, the metallicities are found to be \(0.00\pm0.09\), \(0.02\pm0.11\), \(0.03\pm0.07\), \(0.01\pm0.08\), and \(0.01\pm0.08\) dex, respectively. Furthermore, using these parameters, distance moduli and age of the clusters were also calculated from colour-magnitude diagrams simultaneously using PARSEC theoretical models. The distances to the clusters Dolidze 36, NGC 6728, NGC 6800, NGC 7209, and Platais 1 are \(1050\pm90\), \(1610\pm190\), \(1210\pm150\), \(1060\pm90\), and \(1710\pm250\) pc, respectively, while corresponding ages are \(400\pm100\), \(750\pm150\), \(400\pm100\), \(600\pm100\), and \(175\pm50\) Myr, respectively. Our results are compatible with those found in previous studies. The mass function of each cluster is derived. The slopes of the mass functions of the open clusters range from 1.31 to 1.58, which are in agreement with Salpeter’s initial mass function. We also found integrated absolute magnitudes varying from −4.08 to −3.40 for the clusters.

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Notes

  1. www.tug.tubitak.gov.tr.

  2. IRAF is distributed by the National Optical Astronomy Observatories.

  3. PyRAF is a product of the Space Telescope Science Institute, which is operated by AURA for NASA.

  4. http://astrometry.net.

  5. http://webda.physics.muni.cz.

  6. https://github.com/jobovy/isodist/blob/master/isodist/Isochrone.py.

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Acknowledgements

We thank the anonymous referee for his/her insightful and constructive suggestions, which significantly improved the paper. This study has been supported in part by the Scientific and Technological Research Council (TÜBİTAK) 113F270. Part of this work was supported by the Research Fund of the University of Istanbul, Project Numbers: FDK-2016-22543 and BYP48482. We thank to TÜBİTAK for a partial support in using T100 telescope with project number 15AT100-738. We also thank to the on-duty observers and members of the technical staff at the TÜBİTAK National Observatory for their support before and during the observations.

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Authors and Affiliations

  1. Faculty of Science, Department of Astronomy and Space Sciences, Istanbul University, 34119, Istanbul, Turkey

    Z. F. Bostancı, S. Bilir, T. Ak, T. Güver & S. Ak

  2. Institute of Graduate Studies in Science and Engineering, Programme of Astronomy and Space Sciences, Istanbul University, Beyazıt, 34116, Istanbul, Turkey

    T. Yontan, Ç. S. Başaran, E. Vurgun, B. A. Akti, M. Çelebi & H. Ürgüp

  3. Istanbul University Observatory, Research and Application Center, Beyazıt, 34119, Istanbul, Turkey

    T. Güver

  4. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlár̆ská 2, 611 37, Brno, Czech Republic

    E. Paunzen

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  1. Z. F. Bostancı
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Bostancı, Z.F., Yontan, T., Bilir, S. et al. CCD UBV photometric study of five open clusters—Dolidze 36, NGC 6728, NGC 6800, NGC 7209, and Platais 1. Astrophys Space Sci 363, 143 (2018). https://doi.org/10.1007/s10509-018-3364-4

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