000002812 001__ 2812
000002812 005__ 20160701171711.0
000002812 037__ $$aASTROimport-969
000002812 100__ $$aMarigo, P.
000002812 245__ $$aEvolutionary Models for AGB Stars in the Magellanic Clouds
000002812 260__ $$c2011
000002812 520__ $$aAGB stars in the Magellanic Clouds (MCs) are the most robust calibrators for the modelling of this phase, thanks to the large collection of high-quality data (photometry, chemistry, pulsation properties, mass-loss, dust features, etc.) presently available. As part of an ambitious project aimed at substantially improving  the performance of AGB synthetic models for the MCs, we revise the  stellar models for the MCs. Particular attention is put on the chemical composition, in terms of  both the initial mixture at the epoch of star formation, and the subsequent changes in surface abundances during the TP-AGB phase. We derive the initial chemical composition from recent spectroscopic analyses, which indicate that the MCs present non-scaled-solar ratios for key species such as C, N, O, and a-elements.  The depression of oxygen ([O/Fe] ˜ -0.2) and of nitrogen ([N/Fe] ˜ -1.0), and the rather low metallicity (Z˜ 0.005  instead of the standard Z˜ 0.008) are among the most striking  features.  Evolutionary tracks are calculated with a new updated version of the Padova stellar evolution code, from the pre-main sequence phase  up to the beginning of the TP-AGB phase, which is then decribed by means of our synthetic model.  The changes in the surface abudances (due to  the third dredge-up and hot-bottom burning) are consistenly coupled to  variations in the low-temperature opacities that are computed, for the  first time, on-the-fly with the AESOPUS code (Marigo  Aringer 2009).  Here I decribe the new sets of stellar models, with particular emphasis  on the evolution of S-type and C-type stars, as well of more massive  AGB stars experiencing hot-bottom burning. 
000002812 700__ $$a Bressan, A.
000002812 700__ $$a Girardi, L.
000002812 700__ $$a Aringer, B.
000002812 700__ $$a Gullieuszik, M.
000002812 700__ $$a Groenewegen, M. A. T.
000002812 773__ $$c431$$pWhy Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants$$v445$$y2011
000002812 85642 $$ahttp://esoads.eso.org/abs/2011ASPC..445..431M
000002812 905__ $$apublished in
000002812 980__ $$aNONREF