Abstract
In this study, we carried out CCD UBV photometry of eight open clusters, ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1, Stock 21, and determined their reddening, metallicity, distance, age, and mass functions. We used new Gaia Data Release 2 (DR2) astrometric data to separate cluster member stars from the field stars and obtain precise structural and astrophysical parameters. To identify cluster member stars we utilized an unsupervised membership assignment code (UPMASK), which is based on the photometric and astrometric data. The density distributions for the open clusters show good fits with the empirical King model except for Roslund 1 and Stock 21 not having central concentration. The colour excesses and metallicities were derived separately using \(U-B\times B-V\) two-colour diagrams. Keeping these parameters as constants, we simultaneously calculated distance moduli and ages of the clusters from \(V\times B-V\) and \(V \times U-B\) colour-magnitude diagrams using PARSEC theoretical isochrones. Taking into account Gaia DR2 proper motion components and parallaxes of the member stars, we also calculated mean proper motions and distances for the clusters. Distances derived both from isochrone fitting to colour-magnitude diagrams of the clusters and Gaia DR2 trigonometric parallaxes are compatible with each other. Slopes of the mass functions of the eight open clusters are in good agreement with Salpeter (Astrophys. J. 121:161, 1955) value of 1.35.
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IRAF is distributed by the National Optical Astronomy Observatories.
PyRAF is a product of the Space Telescope Science Institute, which is operated by AURA for NASA.
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Acknowledgements
We thank the anonymous referees for their 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, FBG-2017-23943, and BYP 48482. We thank to TÜBİTAK National Observatory 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. This study is a part of the PhD thesis of Talar Yontan.
This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
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Yontan, T., Bilir, S., Bostancı, Z.F. et al. CCD UBV photometric and Gaia astrometric study of eight open clusters—ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1 and Stock 21. Astrophys Space Sci 364, 152 (2019). https://doi.org/10.1007/s10509-019-3640-y
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DOI: https://doi.org/10.1007/s10509-019-3640-y