Globular Clusters in the Large Magellanic Cloud: An Impact from GAIA Photometry |
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| Authors: | Arūnas Ku?inskas Audrius Brid?ius Vladas Vansevi?ius |
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| Institution: | (1) Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius, 2600, Lithuania;(2) Vilnius University Observatory, Čiurlionio 29, Vilnius, 2009, Lithuania;(3) Institute of Physics, Goštauto 12, Vilnius, 2600, Lithuania |
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| Abstract: | The goal of this work is to assess the expected scientific output from the photometric studies of globular clusters in the
Large Magellanic Cloud with ESA's astrometric space mission GAIA. For this purpose we simulate GAIA photometry of individual
stars in synthetic cluster populations, covering a large range of cluster ages and metallicities. We find that accurate effective
temperatures (Δ T
eff<10%) can be obtained from GAIA photometry down to V ∼ 18 for stars in populations within the studied metallicity range (M/H] = -0.4 ... -1.7). GAIA will also provide photometric
metallicities (Δ M/H] ≲ 0.3 dex) for the cluster giants brighter than V ∼ 17.5. The knowledge of the effective temperature sand metallicities will allow to obtain accurate ages of stellar populations
younger than about 1 Gyr using the usual procedure of main sequence turn-off point fitting. Ages of older stellar populations
(≳ 1 Gyr) may be constrained from the isochrone fits to the giant branches in the observed CMDs. We conclude that GAIA will
provide excellent opportunities for studying star formation histories far beyond the Milky Way, providing means for better
understanding of stellar and galactic evolution in different astrophysical environments.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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