Differential reddening across the field, not rotation, drives the extended main-sequence turn-off in NGC 1647, whose age is 203 million years from lithium measurements.
The differences∆Vr=V LAMOST r − V Gaia r are displayed in the bottom panel along with their aver- age,<∆V r>, and standard deviation, rms
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NGC 1647: A young open cluster with a broad main sequence observed with LAMOST
Differential reddening across the field, not rotation, drives the extended main-sequence turn-off in NGC 1647, whose age is 203 million years from lithium measurements.