Abstract
Stars in the halo of M31 are enriched with heavy elements a factor of ten more than the Milky Way halo. Many M31 globular clusters show high metallicities and enhanced nitrogen abundance, as does the M31 nucleus and near-nuclear regions. The bulk of the nitrogen comes from mass-loss in intermediate-mass asymptotic giant branch stars, a fairly quiescent process incapable of driving enriched gas out of a galaxy. We weigh the relative merits of supernova-wind-driven turbulent mixing versus in-situ large-galactocentric-radius enrichment to explain the observations.
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Worthey, G. (2004). A Coordinated Episode of AGB Star Production at Large Galactocentric Distances in the Andromeda Galaxy?. In: Block, D.L., Puerari, I., Freeman, K.C., Groess, R., Block, E.K. (eds) Penetrating Bars through Masks of Cosmic Dust. Astrophysics and Space Science Library, vol 319. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2862-5_15
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DOI: https://doi.org/10.1007/978-1-4020-2862-5_15
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