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We present new analysis of 11 intermediate-age (1-2 Gyr) star clusters in theLarge Magellanic Cloud based on Hubble Space Telescope imaging data. Seven ofthe clusters feature main sequence turnoff (MSTO) regions that are wider thancan be accounted for by a simple stellar population, whereas their red giantbranches indicate a single value of [Fe/H]. The star clusters cover a range inpresent-day mass from about 1E4 to 2E5 solar masses. We compare radialdistributions of stars in the upper and lower parts of the MSTO region, andcalculate cluster masses and escape velocities from the present time back to acluster age of 10 Myr. Our main result is that for all clusters in our samplewith estimated escape velocities > 15 km/s at an age of 10 Myr, the stars inthe brightest half of the MSTO region are significantly more centrallyconcentrated than the stars in the faintest half AND more massive red giantbranch and asymptotic giant branch stars. This is not the case for clusterswith escape velocities < 10 km/s at an age of 10 Myr. We argue that the wideMSTO region of such clusters is mainly caused by to a 200 - 500 Myr range inthe ages of cluster stars due to extended star formation within the clusterfrom material shed by first-generation stars featuring slow stellar winds.Dilution of this enriched material by accretion of ambient interstellar matteris deemed plausible if the spread of [Fe/H] in this ambient gas was very smallwhen the second-generation stars were formed in the cluster.

astrophysical journal/the astrophysical journal

Population Parameters of Intermediate-Age Star Clusters in the Large  Magellanic Cloud. III. Dynamical Evidence for a Range of Ages Being  Responsible for Extended Main Sequence Turnoffs