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The Star Clusters in the Starburst Irregular Galaxy NGC 1569

The Star Clusters in the Starburst Irregular Galaxy NGC 1569

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aTheStarClustersintheStarburstIrregularGalaxyNGC15691DeidreA.HunterLowellObservatory,1400WestMarsHillRoad,Flagsta ,Arizona86001USA;dah@lowell.eduRobertW.O’ConnellUniversityofVirginia,DepartmentofAstronomy,POBox3818,Charlottesville,Virginia22903-0818USA;rwo@virginia.eduJ.S.GallagherWashburnObservatory,UniversityofWisconsin,475N.CharterSt.,Madison,Wisconsin53706USA;jsg@astro.wisc.eduandTammyA.Smecker-HaneUniversityofCalifornia,DepartmentofPhysicsandAstronomy,4129ReinesHall,Irvine,California92697-4575USA;smecker@carina.ps.uci.eduABSTRACTWeexaminestarclustersintheirregular,starburstgalaxyNGC1569fromHSTimagestakenwith ltersF336W,F555W,andF814W.Inadditiontothetwosuperstarclustersthatarewellknown,weidentify45otherclustersthatarecompactbutresolved.IntegratedUVIcolorsoftheclustersspanalargerange,andcomparison

withcoevalevolutionarymodelssuggestthattheagesrangefrom2–3Myrsto1Gyr.Mostoftheclustershavecolorsconsistentwithagesof≤30Myrsplacingthematthetailendoftherecentburstofstarformation.

Weexaminetheradialsurfacebrightnesspro lesoffouroftheclusters,and tKingmodelstothreeofthem.Thecolorsoftheclustersareapproximatelyconstantwithradius.Thefourclustershavehalf-lightradiiandcoreradiithatareintherangeobservedinpresent-dayglobularclustersinourGalaxy.However,theyaresomewhatlessconcentratedthattheaverageglobular.Thetwowell-knownsuperstarclustershaveluminosities,andonehasaknownmass,thatarecomparabletothoseoftypical

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