Deep Washington photometry of inconspicuous star cluster candidates in the Large Magellanic Cloud

Abstract

We present deep Washington photometry of 45 poorly populated star cluster candidates in the Large Magellanic Cloud (LMC). We have performed a systematic study to estimate the parameters of the cluster candidates by matching theoretical isochrones to the cleaned and de-reddened cluster color-magnitude diagrams (CMDs). We were able to estimate the basic parameters for 33 clusters, out of which, 23 are identified as single clusters and 10 are found to be members of double clusters. Other 12 cluster candidates have been classified as possible clusters/asterisms. About 50% of the true clusters are in the 100-300 Myr age range, while some are older or younger. We have discussed the distribution of age, location, reddening with respect to field as well as size of true clusters. The sizes and masses of the studied sample are found to be similar to that of open clusters in the Milky Way. Our study adds to the lower end of cluster mass distribution in the LMC, suggesting that the LMC apart from hosting rich clusters also has formed small, less massive open clusters in the 100-300 Myr age range.

arXiv comment40 pages, 19 figures, 3 tables, Accepted for publication in the Astronomical Journal

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• The VMC survey - XVI. Spatial variation of the cluster-formation activity in the innermost regions of the Large Magellanic Cloud
• Detailed equilibrium and dynamical tides: impact on circularization and synchronization in open clusters
• A catalogue of Large Magellanic Cloud star clusters observed in the Washington photometric system
• Spatio-temporal map of star clusters in the Magellanic Clouds using Gaia: Synchronized peaks and radial shrinkage of cluster formation
• An ongoing tidal capture in the Large Magellanic Cloud: the low-mass star cluster KMK88-10 captured by the massive globular cluster NGC 1835?