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Photometric Study of the Open Cluster NGC 225

Abstract—NGC 225 is a young moderately populated cluster with discrepant age, distance, and color excess estimates reported by different authors. We combine our photometry with the data from large surveys (2MASS, WISE, Pan-STARRS) to derive the parameters of NGC 225 and study the extinction law in the near infrared in the direction of the cluster. We use theoretical isochrones to infer the color excess \(E(B - V) = 0.29 \pm 0.01\), distance \(D = 667 \pm 18\) pc, and Age = \(100\)\(160\) Myr. We fit extinction in the infrared by a power-law relation, \({{\lambda }^{{ - \alpha }}}\), and find \(\alpha = 2.16 \pm 0.34\).

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ACKNOWLEDGMENTS

The authors thank Andrey Dambis for the help with the preparation of the article for publication.

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.

This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.

This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration.

The Pan-STARRS1 Surveys (PS1) and the PS1 public science archive have been made possible through contributions by the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and the Max Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, Durham University, the University of Edinburgh, the Queen’s University Belfast, the Harvard-Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under Grant no. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation Grant No. AST-1238877, the University of Maryland, Eotvos Lorand University (ELTE), the Los Alamos National Laboratory, and the Gordon and Betty Moore Foundation.

Funding

The reported study was funded by the Russian Foundation for Basic Research, project no. 20-32-90124.

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Correspondence to L. N. Yalyalieva.

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Yalyalieva, L.N., Glushkova, E.V., Carraro, G. et al. Photometric Study of the Open Cluster NGC 225. Astrophys. Bull. 77, 78–83 (2022). https://doi.org/10.1134/S1990341322010126

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  • DOI: https://doi.org/10.1134/S1990341322010126

Keywords:

  • (Galaxy): open clusters and associations:
  • general—(Galaxy):
  • open clusters and associations:
  • individual: NGC225—techniques: photometric