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2 Acta Astronomica

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OGLE Collection of Star Clusters. New Objects in the Outskirts of the Large Magellanic Cloud

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Sitek M. , Szymański M. K. , Skowron D. M. , Udalski A. , Kostrzewa-Rutkowska Z. , Skowron J. , Karczmarek P. , Cieślar M. , Wyrzykowski Ł. , Kozłowski S. , Pietrukowicz P. , Soszyński I. , Mróz P. , Pawlak M. , Poleski R. , Ulaczyk K.

tom Vol. 66, No. 3

255--267

The Magellanic System (MS), consisting of the Large Magellanic Cloud (LMC), the Small Magellanic Cloud (SMC) and the Magellanic Bridge (MBR), contains diverse sample of star clusters. Their spatial distribution, ages and chemical abundances may provide important information about the history of formation of the whole System. We use deep photometric maps derived from the images collected during the fourth phase of the Optical Gravitational Lensing Experiment (OGLE-IV) to construct the most complete catalog of star clusters in the Large Magellanic Cloud using the homogeneous photometric data. In this paper we present the collection of star clusters found in the area of about 225 square degrees in the outer regions of the LMC. Our sample contains 679 visually identified star cluster candidates, 226 of which were not listed in any of the previously published catalogs. The new clusters are mainly young small open clusters or clusters similar to associations.

OGLE Collection of Star Clusters. New Objects in the Magellanic Bridge and the Outskirts of the Small Magellanic Cloud

100%

Sitek M. , Szymański M. K. , Udalski A. , Skowron D. M. , Kostrzewa-Rutkowska Z. , Skowron J. , Karczmarek P. , Cieślar M. , Wyrzykowski Ł. , Kozłowski S. , Pietrukowicz P. , Soszyński I. , Mróz P. , Pawlak M. , Poleski R. , Ulaczyk K.

tom Vol. 67, No. 4

363--378

The Magellanic System (MS) encompasses the nearest neighbors of the Milky Way, the Large (LMC) and Small (SMC) Magellanic Clouds, and the Magellanic Bridge (MBR). This system contains a diverse sample of star clusters. Their parameters, such as the spatial distribution, chemical composition and age distribution yield important information about the formation scenario of the whole Magellanic System. Using deep photometric maps compiled in the fourth phase of the Optical Gravitational Lensing Experiment (OGLE-IV) we present the most complete catalog of star clusters in the Magellanic System ever constructed from homogeneous, long time-scale photometric data. In this second paper of the series, we show the collection of star clusters found in the area of about 360 square degrees in the MBR and in the outer regions of the SMC. Our sample contains 198 visually identified star cluster candidates, 75 of which were not listed in any of the previously published catalogs. The new discoveries are mainly young small open clusters or clusters similar to associations.