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Paper: A Formation of Stephan's Quintet based on Star Clusters
Volume: 458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page: 343
Authors: Sohn, J.; Lim, S.; Lee, M. G.
Abstract: We present a study of star clusters in Stephan's Quintet based on the F438W, F606W, and F814W images taken with Wide Field Camera3 (WFC3) of the Hubble Space Telescope (HST). We detected 1,087 star cluster candidates with V < 26.3 mag through the visual inspection. Color magnitude diagrams of the star clusters show that the star clusters are mostly divided into two groups: blue clusters with B-V < 0.7 and red clusters with B-V > 0.7. Both blue and red clusters are found in the NGC 7318 system (E2+SBbc pec) and NGC 7319 (SBbc), while only red clusters are detected in NGC 7317 (E4). We derive the ages of the star clusters by comparing photometric data with theoretical synthesis population model. NGC 7317 clusters are all old (age > 1 Gyr). On the other hand, NGC 7318 and NGC 7319 have both old clusters and young clusters. The cluster age distributions in NGC 7318 and NGC 7319 show peaks at different position, the former at ∼ 1.2 – 2 Gyr, the later at ∼ 400 Myr.
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