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| Paper: |
Evolved Stellar Populations in Nearby Galaxies: The Near-Infrared Perspective |
| Volume: |
374, From Stars to Galaxies: Building the Pieces to Build Up the Universe |
| Page: |
261 |
| Authors: |
Held, E.V.; Gullieuszik, M.; Rizzi, L.; Saviane, I.; Ortolani, S.; Momany, Y. |
| Abstract: |
We present near-infrared observations of the distant Milky Way satellite galaxies Leo I and Leo II, obtained with the new wide-field imager WF-CAM at the UKIRT telescope as part of a study of evolved stars (Red Giant and Asymptotic Giant Branch stars) in Local Group dwarf spheroidal galaxies. Optical-infrared colors, which are more accurate metallicity indicators than optical or infrared colors alone, have been used to estimate the metallicity distribution of the red giant stars. Using near-infrared magnitudes and colors of luminous asymptotic giant branch (AGB) stars we have been able to discriminate carbon- and oxygen-rich AGB stars and derive their distributions in bolometric luminosity. In turn, the properties of AGB stars in different galactic environments will provide information on the star-formation histories of the parent galaxies. |
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