significant age range in massive star cluster excluded by tight sub-giant-branch morphology...
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Significant age range in massive star cluster excluded by tight sub-giant-branch morphology
Chengyuan LiRichard de GrijsLicai Deng
Science lead the way.以化成天下。
![Page 2: Significant age range in massive star cluster excluded by tight sub-giant-branch morphology Chengyuan Li Richard de Grijs Licai Deng Science lead the way](https://reader035.vdocuments.us/reader035/viewer/2022062417/551bf6ed5503469e4f8b46fa/html5/thumbnails/2.jpg)
Multiple stellar populations in Magellanic Cloud clusters, an ordinary feature for intermediate age globulars in the LMC?
--- Milone et al.2009
~300 Myr age spread
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Multiple stellar populations in Magellanic Cloud clusters, an ordinary feature for intermediate age globulars in the LMC?
--- Milone et al.2009
NGC 1868: 320 Myr age spreadLi et al. 2014
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How to detect multiple stellar populations in Galactic Globular Clusters?
• Multiple or Broadened• Main Sequence(s),• Sub-giant branch(es), • Red-giant branch(es) • Horizontal-branch(es)
Omega-Centauri: Villanova et al.2007
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Extended Main-Sequence Turn-Off should link to a broadened Sub-giant-branch, but where is it?
NGC 1651: Li et al. 2014, Nature, accepted
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Extended Main-Sequence Turn-Off should link to a broadened Sub-giant-branch, but where is it?
NGC 1651: Li et al. 2014, Nature, accepted
Age spread: 450 Myr (eMSTO), SSP (SGB)
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Is this feature unique for NGC 1651?
NGC 2155SL 674Piatta et al. 2014
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Multiple stellar populations in Magellanic Cloud clusters, an ordinary feature for intermediate age globulars in the LMC?
--- Milone et al.2009Single stellar population suggested by tight sub-giant-branch,
an ordinary feature for intermediate age globulars in the LMC? --- Li et al.2014
Questions: Why sub-giant-branch is ideal?1, It direct link to turn-off region.2, It easy to learn, do not experience significant mass loss.3, It ideally get rid of the effect from fast rotating.
Narrow sub-giant-branch ideal single stellar population
Why there is no one found this feature for a long time? (set by Luis)1, Not every clusters show clear sub-giant-branch.2, Bias.3, People already began action (Nate Bastian group, 2014, prepare to submit)
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Science lead the way.以化成天下。
The Significance: 1, Single stellar population still hold for intermediate-age star clusters.2, No additional physics is needed to prevent gas from collapsing into star forming.3, No need for us to expect a tremendous massive origin.4, Stellar rotating seems important for intermediate-age star clusters.
Thanks!