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PRODID:https://murmitoyen.com/events/vanille/udem/
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UID:69e077b9c5a01
DTSTAMP:20260416T014633
DTSTART:20131212T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20131212T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/345280
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:The Age and Helium Abundance of the Galactic Bulge
DESCRIPTION:Conférence de David M. Nataf\, Australian National University.
 Résumé I discuss the ongoing issue of the age and helium abundance of t
 he Galactic bulge stellar population and summerise historical and recent a
 ttempts to measure these two values. I discuss how the age and heliumabund
 ance of a stellar population can be degenerate observationally\, and thus 
 how unstated assumptions of the helium-metallicity relation can result in 
 biased age-metallicity determinations.Finally\, I present efforts to tackl
 e this degeneracy using chemical evolution models\, forward modelling of o
 bservational selection effects using Galactic-structure-based microlensing
  models\, and upcoming mass measurements of detached red giant eclipsing b
 inary twins. I make the case that the degeneracy between these two paramet
 ers can be resolved with currently available instrumentation and software\
 , and both of these fundamental parameters of Galactic history can be meas
 ured to 1 part in 10 or better in the near future.Présentée par le Group
 e Astronomie et astrophysique du Département de physique de l'Universit
 é de Montréal. Cette conférence est destinée à des spécialistes dans
  le domaine de l'astrophysique et sera donnée en anglais.
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