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arXiv · 1411.3125

Constraining Mass-Loss & Lifetimes of Low Mass, Low Metallicity AGB Stars

Philip Rosenfield·Paola Marigo·Leo Girardi·Julianne J. Dalcanton·Alessandro Bressan·Marco Gullieuszik·Daniel Weisz·Benjamin F. Williams·Andrew Dolphin·Bernhard Aringer
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Abstract

The evolution and lifetimes of thermally pulsating 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, lower mass TP-AGB stars (M < 1 Msun) must have lifetimes less than about 1.2 Myr.

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Philip Rosenfield, Paola Marigo, Leo Girardi, Julianne J. Dalcanton, Alessandro Bressan, Marco Gullieuszik, Daniel Weisz, Benjamin F. Williams, Andrew Dolphin, Bernhard Aringer. 2014-11-12. Constraining Mass-Loss & Lifetimes of Low Mass, Low Metallicity AGB Stars. https://arxiv.org/abs/1411.3125

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