1 / 7

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.

renee-bradshaw
Download Presentation

6.4.1 Globular Cluster Ages

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 ?

More Related