Abstract
Intense study of the stellar population of the nuclear bulge during the last decade has provided important insights into the populations of other bulges and ellipticals. Due to the wide range of abundances in these populations, one expects to find a complex evolved population, with late M giants and RR Lyrae stars coexisting in the same volume. In the galactic bulge, the abundance distribution can be fit by the closed box model; the discovery of correlations between color and local escape velocity in ellipticals suggests that the one-zone model with a wind could describe the abundance distributions in most spheroidal populations. There is growing evidence for an age range as well. Luminous M giants have been found in the bulge of the Milky Way and most recently in the bulge of M31. We consider the possibility that bulges may be formed in starbursts that do not necessarily have to occur at early times.
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Rich, R.M. (1992). Stellar Content and Chemical Evolution in Spheroidal Populations. In: Longo, G., Capaccioli, M., Busarello, G. (eds) Morphological and Physical Classification of Galaxies. Astrophysics and Space Science Library, vol 178. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2522-2_7
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DOI: https://doi.org/10.1007/978-94-011-2522-2_7
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