August 11-15, 2014


A population synthesis study of the white dwarf cooling sequence of 47~Tucanae

Santiago Torres (Universitat Politècnica de Catalunya/BarcelonaTech)

Enrique García-Berro (UPC), Leandro Althaus (Universidad Nacional de la Plata) & Marcelo M. Miller Bertolami (Max-Planck-Institute für Astrophysiks)

We present a population synthesis study of the cooling sequence of the globular cluster 47~Tucanae. We study the distribution of effective temperatures, the morphology of the color-magnitude diagram, and the magnitude and color distributions. We find that our Monte Carlo simulations are in very good agreement with the observational data, once all the observational biases are taken into account. Our study also rules out previous claims that there are still missing physics in the white dwarf cooling models at moderately high effective temperatures. We also fit the age of the cluster using the termination of the cooling sequence, finding an age consistent that determined using the main-sequence turn-off. Finally, we also investigate the star formation history of the cluster, finding good agreement with that obtained using main sequence stars, which predict the existence of two distinct populations.

Mode of presentation: oral