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Paper: Constraining Mass Loss and Lifetimes of Low Mass, Low Metallicity AGB Stars
Volume: 497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time
Page: 423
Authors: Rosenfield, P.; Marigo, P.; Girardi, L.; Dalcanton, J. J.; Bressan, A.; Gullieuszik, M.; Weisz, D. R.; Williams, B. F.; Dolphin, A.; Aringer, B.
Abstract: The evolution and lifetimes of thermally pulsing asymptotic giant branch (TP-AGB) stars suffer from significant uncertainties. We present a detailed framework for constraining model luminosity functions of TP-AGB stars using resolved stellar populations. We show an example of this method that compares various TP-AGB mass-loss prescriptions that differ in their treatments of mass loss before the onset of dust-driven winds (pre-dust). We find that models with more efficient pre-dust driven mass loss produce results consistent with observations, as opposed to more canonical mass-loss models. Efficient pre-dust driven mass-loss predicts, for [Fe/H] ≲ –1.2, that lower mass TP-AGB stars (M≲ 1 M) must have lifetimes less than about 1.2 Myr.
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