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A Double Main Sequence in the Globular Cluster NGC 6397

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arxiv 1110.1077 v1 pith:6RVKPAXB submitted 2011-10-05 astro-ph.SR

A. P. Milone , A. F. Marino , G. Piotto , L. R. Bedin , J. Anderson , A. Aparicio , S. Cassisi , R. M. Rich This is my paper
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keywords sequenceclusterstarscolorcontainingdoubleenhancedglobular
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High-precision multi-band HST photometry reveals that the main sequence (MS) of the globular cluster NGC 6397 splits into two components, containing ~30% and ~70% of the stars. This double sequence is consistent with the idea that the cluster hosts two stellar populations: (i) a primordial population that has a composition similar to field stars, and containing ~30% of the stars, and (ii) a second generation with enhanced sodium and nitrogen, depleted carbon and oxygen, and a slightly enhanced helium abundance (Delta Y~0.01). We examine the color difference between the two sequences across a variety of color baselines and find that the second sequence is anomalously faint in m_F336W. Theoretical isochrones indicate that this could be due to NH depletion.

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    astro-ph.SR 2026-03 unverdicted novelty 8.0 of 10

    A new histogram-free likelihood method applied to simulated JWST observations of brown dwarfs shows that globular cluster ages can be determined with formal errors under 0.2 Gyr.

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