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6.4.1 Globular Cluster Ages

6.4.1 Globular Cluster Ages. Hansung B. Gim Dep. of Astronomy. Turnoff Point Ages. Berghbusch & van den Bergh (1992). i) m app of the turnoff point ii) distance from MS-fitting or RR Lyrae iii) metallicity. Isochrone Fitting. The ΔV Method.

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6.4.1 Globular Cluster Ages

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  1. 6.4.1 Globular Cluster Ages Hansung B. Gim Dep. of Astronomy

  2. Turnoff Point Ages Berghbusch & van den Bergh (1992) i) mapp of the turnoff point ii) distance from MS-fitting or RR Lyrae iii) metallicity

  3. Isochrone Fitting

  4. The ΔV Method Indep. of distance modulus & differential reddening the safest method for measuring ages

  5. The Δ(B-V) Method Indep. of metallicity

  6. Comparison with the Age of the Universe Quasar @ z~5 Presence of C, N, O ~1 Gyr for formations of GCs after the Big Bang Problems i) Absolute Calibrations ii) Uncertainties in basic physics (opacity) iii) Error in stages of stellar structure calculations

  7. Variations in Age ΔV~metallicity Tidally stripping from dwarfs ?

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