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Structure and evolution of multi-cluster within Galactic disc: Gaia DR3 insights into eight open clusters.

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Title: Structure and evolution of multi-cluster within Galactic disc: Gaia DR3 insights into eight open clusters.
Authors: AHMED, A1 (AUTHOR) ahamza@sci.cu.edu.eg, ELSANHOURY, W H2 (AUTHOR) elsanhoury@nriag.sci.eg, ÇINAR, D C3 (AUTHOR) denizcennetcinar@gmail.com, HAROON, A A4,5 (AUTHOR) aaharoon@kau.edu.sa, ALENAZI, M S2 (AUTHOR), ELKHOLY, E A2,5 (AUTHOR)
Source: Journal of Astrophysics & Astronomy. 6/3/2026, Vol. 47 Issue 1, p1-33. 33p.
Subjects: Open clusters of stars, Stellar dynamics, Astronomical surveys, Disk galaxies, Stellar initial mass function, Star clusters
Abstract: In this study, we present a comprehensive analysis of the structural, astrophysical, and dynamical properties of eight open clusters: NGC 559, NGC 1817, NGC 2141, NGC 7245, Ruprecht 15, Ruprecht 137, Ruprecht 142, and Ruprecht 169, utilizing the precise astrometric and photometric data from Gaia Data Release 3. By fitting King's model to the radial density profiles, we determined their structural parameters, including core and cluster limiting radii, which were found to be in the ranges of 3.07 – 16.21 arcmin and 9.97 – 25.97 arcmin, respectively. The fundamental astrophysical parameters were derived by fitting PARSEC isochrones to the colour-magnitude diagrams. Our analysis indicates that the clusters' logarithmic ages span from 7.95 to 9.34 years, with metallicities ranging between 0.007 – 0.015 and heliocentric distances from 1640 to 5203 pc. The total stellar masses for the clusters were calculated to be within the range of 257 – 1916 M ⊙ . The slopes of the mass function for most clusters were found to be consistent with the Salpeter initial mass function. Furthermore, our dynamical analysis suggests that all investigated clusters except Ruprecht 15 show signs of being dynamically relaxed. Notably, the spatial distribution and bimodal structure observed in the radial density profile of NGC 7245 provide strong evidence that it is a binary cluster candidate. Finally, our kinematic analysis and orbit integration show that the clusters possess dynamical properties that are fully consistent with their membership in the Galactic thin disc. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Astrophysics & Astronomy is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Structure and evolution of multi-cluster within Galactic disc: Gaia DR3 insights into eight open clusters.
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  Data: <searchLink fieldCode="AR" term="%22AHMED%2C+A%22">AHMED, A</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ahamza@sci.cu.edu.eg</i><br /><searchLink fieldCode="AR" term="%22ELSANHOURY%2C+W+H%22">ELSANHOURY, W H</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> elsanhoury@nriag.sci.eg</i><br /><searchLink fieldCode="AR" term="%22ÇINAR%2C+D+C%22">ÇINAR, D C</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> denizcennetcinar@gmail.com</i><br /><searchLink fieldCode="AR" term="%22HAROON%2C+A+A%22">HAROON, A A</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<i> aaharoon@kau.edu.sa</i><br /><searchLink fieldCode="AR" term="%22ALENAZI%2C+M+S%22">ALENAZI, M S</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22ELKHOLY%2C+E+A%22">ELKHOLY, E A</searchLink><relatesTo>2,5</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Astrophysics+%26+Astronomy%22">Journal of Astrophysics & Astronomy</searchLink>. 6/3/2026, Vol. 47 Issue 1, p1-33. 33p.
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  Data: <searchLink fieldCode="DE" term="%22Open+clusters+of+stars%22">Open clusters of stars</searchLink><br /><searchLink fieldCode="DE" term="%22Stellar+dynamics%22">Stellar dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Astronomical+surveys%22">Astronomical surveys</searchLink><br /><searchLink fieldCode="DE" term="%22Disk+galaxies%22">Disk galaxies</searchLink><br /><searchLink fieldCode="DE" term="%22Stellar+initial+mass+function%22">Stellar initial mass function</searchLink><br /><searchLink fieldCode="DE" term="%22Star+clusters%22">Star clusters</searchLink>
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  Label: Abstract
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  Data: In this study, we present a comprehensive analysis of the structural, astrophysical, and dynamical properties of eight open clusters: NGC 559, NGC 1817, NGC 2141, NGC 7245, Ruprecht 15, Ruprecht 137, Ruprecht 142, and Ruprecht 169, utilizing the precise astrometric and photometric data from Gaia Data Release 3. By fitting King's model to the radial density profiles, we determined their structural parameters, including core and cluster limiting radii, which were found to be in the ranges of 3.07 – 16.21 arcmin and 9.97 – 25.97 arcmin, respectively. The fundamental astrophysical parameters were derived by fitting PARSEC isochrones to the colour-magnitude diagrams. Our analysis indicates that the clusters' logarithmic ages span from 7.95 to 9.34 years, with metallicities ranging between 0.007 – 0.015 and heliocentric distances from 1640 to 5203 pc. The total stellar masses for the clusters were calculated to be within the range of 257 – 1916 M ⊙ . The slopes of the mass function for most clusters were found to be consistent with the Salpeter initial mass function. Furthermore, our dynamical analysis suggests that all investigated clusters except Ruprecht 15 show signs of being dynamically relaxed. Notably, the spatial distribution and bimodal structure observed in the radial density profile of NGC 7245 provide strong evidence that it is a binary cluster candidate. Finally, our kinematic analysis and orbit integration show that the clusters possess dynamical properties that are fully consistent with their membership in the Galactic thin disc. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Astrophysics & Astronomy is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Open clusters of stars
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      – SubjectFull: Stellar dynamics
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      – SubjectFull: Astronomical surveys
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      – SubjectFull: Disk galaxies
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              Text: 6/3/2026
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