WFPC2 Observations of the Small Magellanic Cloud Intermediate-Age Populous Cluster NGC 416

Details WFPC2 Observations of the Small Magellanic Cloud Intermediate-Age Populous Cluster NGC 416 WFPC2 Observations of the Small Magellanic Cloud Intermediate-Age Populous Cluster NGC 416

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.7908f&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #79.08; Bulletin of the American Astronomical Society, Vol. 29, p.1337

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Scientific paper

We present our analysis of archival Hubble Space Telescope Wide Field Planetary Camera 2 observations in F555W ({ ~ }V) and F450W ({ ~ }B) of the intermediate-age populous star cluster NGC 416 in the Small Magellanic Cloud galaxy. We use published photometry of two other SMC populous star clusters, Lindsay 1 and Lindsay 113, to investigate the age sequence of these three star clusters. We determined the following ratios of ageNGC416/ageL1{ =~ }0.73{+/-}0.05 and ageL113/ageL1{ =~ }0.52{+/-}0.09. These age ratios provide absolute age estimates of 6.6{+/-}0.5 Gyr and 4.7{+/-}0.8 Gyr for NGC 416 and Lindsay 113, respectively, assuming that Lindsay 1 is 9 Gyr old. Metallicities of [Fe/H]=-1.44{+/-}0.12, -1.35{+/-}0.08, -1.24{+/-}0.11 dex, and reddenings of E({bv })=0.08{+/-}0.03, 0.06{+/-}0.02, 0.00{+/-}0.02 mag for NGC 416, Lindsay 1, and Lindsay 113, respectively, were determined simultaneously using the method of Sarajedini & Layden [AJ, 113, 264 (1997)]. The determination of accurate (relative) ages for the intermediate-age populous clusters in the Small Magellanic Cloud (e.g. via deep main sequence photometry) would allow the d_{(B-V)} method of Sarajedini, Lee, & Lee [ApJ, 450, 712 (1995)] to be extended to ages significantly younger than 7 Gyr. The extended d_{(B-V)} method could prove to be a very useful age diagnostic for future studies of the intermediate-age metal-poor stellar populations in nearby Local Group galaxies where accurate main-sequence turnoff photometry at MV{ =~ }+4 mag is currently not possible or practical.

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