J/AJ/116/2395 BV photometry in five SMC clusters (Mighell+, 1998) ================================================================================ WFPC2 observations of star clusters in the Magellanic clouds. II. The oldest star clusters in the Small Magellanic Cloud. Mighell K.J., Sarajedini A., French R.S. =1998AJ....116.2395M (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Magellanic Clouds ; Photometry, UBV ; Clusters, open Keywords: galaxies: evolution - galaxies: individual: Small Magellanic Cloud - galaxies: star clusters - galaxies: Local Group Abstract: We present our analysis of archival Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) observations in F450W (~B) and F555W (~V) of the intermediate-age populous star clusters NGC 121, NGC 339, NGC 361, NGC 416, and Kron 3 in the Small Magellanic Cloud. We use published photometry of two other SMC populous star clusters, Lindsay 1 and Lindsay 113, to investigate the age sequence of these seven star clusters in order to improve our understanding of the formation chronology of the SMC. We analyzed the V versus B-V and M_V_ versus (B-V)_0_ color-magnitude diagrams of these populous Small Magellanic Cloud star clusters using a variety of techniques and determined their ages, metallicities, and reddenings. These new data enable us to improve the age-metallicity relation of star clusters in the Small Magellanic Cloud. In particular, we find that a closed-box continuous star formation model does not reproduce the age-metallicity relation adequately. However, a theoretical model punctuated by bursts of star formation is in better agreement with the observational data presented herein. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file tables.dat 46 34732 WFPC2 stellar photometry of the SMC clusters NGC 416, 121, 339, 361 and Kron 3 -------------------------------------------------------------------------------- Byte-by-byte Description of file: tables.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 A7 --- Cluster Cluster name 9- 17 I9 --- MSF Identification number in the cluster (1) 20- 25 F6.3 mag Vmag V magnitude 28- 32 F5.3 mag e_Vmag rms uncertainty on Vmag 34- 39 F6.3 mag B-V colour index 42- 46 F5.3 mag e_B-V rms uncertainty on B-V -------------------------------------------------------------------------------- Note (1): Cl* "Cluster" MSF Nyyyyxxxx in Simbad, where N is the WFPC2 chip number (1, 2, 3 or 4), yyyy the y coordinate of the star multiplied by 10 and xxxx the x coordinate of the star multiplied by 10. -------------------------------------------------------------------------------- History: From AJ electronic version References: Mighell et al., (Hodge 11) Paper I. 1996AJ....111.2314M ================================================================================ (End) James Marcout, Patricia Bauer [CDS] 05-Jan-1999