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| Paper: |
Luminous AGB Stars beyond the Local Group: Tracers of
Intermediate-age Populations in the Cen A Group |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
525 |
| Authors: |
Crnojević, D.; Rejkuba, M.; Grebel, E. K.; Da Costa, G.; Jerjen, H. |
| Abstract: |
We investigate the resolved stellar content of three predominantly old
and metal-poor early-type dwarf galaxies in the Centaurus A group (at
a distance of ∼4 Mpc). Our goal is to estimate the fraction of
the intermediate-age populations (IAPs) and the period of most recent
star formation from their luminous AGB stars. We combine optical
HST/ACS and near-infrared VLT/ISAAC images to identify AGB star candidates.
The first dataset provides high-resolution photometry while the second
one permits us to disentangle the galaxies’ stellar content from the
foreground contamination and to characterize the IAPs. The IAP fraction
is found to be very low in the target galaxies (up to ∼15%).
We compare the results to our own Local Group. |
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