Evolution of AGB stars at varying surface C/O ratio: The crucial effect of molecular opacities

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dc.creatorMarigo, P.
dc.date2002-12-11
dc.date.accessioned2026-07-07T02:06:50Z
dc.date.available2026-07-07T02:06:50Z
dc.descriptionThis study calls attention to the importance of properly coupling the molecular opacities to the actual surface abundances of TP-AGB stars that experience the third dredge-up and/or hot-bottom burning, i.e. with surface abundances of carbon and oxygen varying with time. New TP-AGB calculations with variable opacities -- replacing the usually adopted solar-scaled opacity tables -- have proven to reproduce, for the first time, basic observables of carbon stars, like their effective temperatures, C/O ratios, and near-infrared colours. Moreover, it turns out that the effect of envelope cooling -- due to the increase in molecular opacities -- may cause other important effects, namely: i) shortening of the C-star phase; ii) possible reduction or shut-down of the third dredge-up in low-mass carbon stars; and iii) weakening or even extinction of hot-bottom burning in intermediate-mass stars.
dc.description6 pages, 5 postscript figures, proceedings of contributed talk at the St. Luc conference ``CNO in the Universe'', eds. C. Charbonnel, D. Schaerer, & G. Meynet, to be published in the ASP Conference Series
dc.identifierhttps://arxiv.org/abs/astro-ph/0212261
dc.identifierhttp://arxiv.org/abs/astro-ph/0212261
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5500
dc.subjectAstrophysics
dc.titleEvolution of AGB stars at varying surface C/O ratio: The crucial effect of molecular opacities
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