Stellar Populations of Bulges and Disks: New Insights from Near-IR Colours
Colours of spiral galaxies generally are affected by the underlying old stellar population, younger stars, and extinction by dust. Old and young populations generally can be disentangled using a combination of blue and near-infrared colours. Extinction effects are very hard to take into account, except for galaxies with special orientations. In
Peletier, R. et al.
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1996