A new Extended Main Sequence Turnoff star cluster in the Large Magellanic Cloud
arXiv:1301.1627 · doi:10.1093/mnras/stt054
Abstract
We present results on the age and metallicity estimates of the poorly studied LMC cluster SL 529, from CCD SDSS gr photometry obtained at the Gemini South telescope with the GMOS attached. The cluster MSTO region possesses an extended structure, with an age spread (~ 0.5 Gyr) bigger than the mean age width of known EMSTO LMC clusters. We report for the first time a mean cluster age of 2.25 Gyr and a mean cluster metallicity of Z=0.004, which place it as the most metal-poor and oldest cluster in the EMSTO LMC cluster group. In addition, the cluster RC appears to be formed by two concentrations of stars - although it is not clear whether this feature can be caused, in part, by binary interactions and mergers -, whereas the cluster core radius of 4.2 pc is in excellent agreement with those determined for the previously 12 known EMSTO LMC clusters.
6 pages, 6 figures, MNRAS (accepted)
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- Controversial Age Spreads from the Main Sequence Turn-Off and Red Clump in Intermediate-Age Clusters in the LMC
- A systematic study of effects of stellar rotation, age spread and binaries on color-magnitude diagrams with extended main-sequence turn-offs
- Explanation of a special color-magnitude diagram of star cluster NGC 1651 from different models
- The star cluster frequency throughout the Large Magellanic Cloud
- Extended Main Sequence Turn-Offs in Low Mass Intermediate Age Clusters
- Gemini/GMOS photometry of intermediate-age star clusters in the Large Magellanic Cloud
- Searching for chemical inhomogeneities in Open Clusters: Analysis of the CN and CH Molecular Band Strengths in NGC 2158, NGC 2420, NGC 2682, NGC 7789 and Berkeley 29
- The effects of the overshooting of the convective core on main-sequence turnoffs of young- and intermediate-age star clusters
- An Analysis of the Population of Extended Main Sequence Turn-off Clusters in the Large Magellanic Cloud
- The extended Main-Sequence Turnoff of the Milky Way open cluster Collinder 347