Binary fractions and mass ratio distribution indices of 61 open clusters

May 25, 2026Open Access

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Key Points

This research aims to analyze binary fractions and mass ratio distribution indices in open clusters to enhance understanding of stellar formation processes.
Analyzed data from 61 open clusters in the LISC catalog.
Applied the Powerful CMD code and advanced stellar population synthesis model for isochrone fitting.
Utilized a Bayesian framework with the Markov chain Monte Carlo method for joint estimation of binary fractions and mass distribution indices.
Binary fraction (f_ b ) values ranged from 0.333 to 0.611 and decreased over time.
Mass ratio distribution indices (γ_ q ) mostly ranged between -0.131 and 0.113, with few exceptions outside the 2σ range.
Significant positive correlation between f_ b values and LISC catalog, with a linear regression R^2 of 0.83.

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Examines binary fractions and mass ratio in open clusters, suggesting insights into stellar evolution.

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Lan et al. (2026) studied this question.

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