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| Paper: |
Metallicity Distribution of the Galactic Halo from SDSS Photometry |
| Volume: |
458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way |
| Page: |
179 |
| Authors: |
An, D.; Beers, T. C.; Johnson, J. A.; Pinsonneault, M. H.; Lee, Y. S.; Ivezić, Z.; Newby, M. |
| Abstract: |
We describe the methodology required for the estimation of photometric metallicity from the
SDSS ugriz passbands and present a preliminary metallicity distribution of the Galactic halo
system. Stellar isochrones have been empirically calibrated against observations of several star
clusters over a wide range of metal abundance, and the accuracy of photometric Teff and [Fe/H]
from these models has been confirmed using the Infrared Flux Method (IRFM) temperature scale
and [Fe/H] values from SDSS/SEGUE. Based on these models, we estimate distances
and metallicities for individual main-sequence stars in the SDSS Stripe 82 region, and present a
preliminary in situ metallicity distribution of the halo system. Correlations between kinematic
and metallicity distributions are discussed. |
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