http://arxiv.org/abs/1705.08186
We report the serendipitous young Large Magellanic Cloud cluster, NGC 1971, exhibits an extended main-sequence turnoff (eMSTO) possibly originated by mostly a real age spread. We used CT1 Washington photometry to produce a colour-magnitude diagram (CMD) with the fiducial cluster features. From its eMSTO, we estimated an age spread of ~ 170 Myr (observed age range 100-280 Myr), once observational errors, stellar binarity, overall metalicity variations and stellar rotation effects were subtracted in quadrature from the observed age width.
A. Piatti and A. Cole
Wed, 24 May 17
16/70
Comments: 5 pages, 5 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society Letters