8 papers · 1 filter
Constraining the third dredge-up via carbon stars in the Magellanic Clouds
L. Girardi, P. Marigo
We use the available data for Magellanic Cloud carbon stars to constrain the efficiency of the third dredge-up process in TP-AGB models. We show that star counts in LMC clusters pr…
Evolution of AGB stars at varying surface C/O ratio: The crucial effect of molecular opacities
P. Marigo
This 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/o…
Evolution of zero-metallicity massive stars
P. Marigo, C. Chiosi, L. Girardi +1
We discuss the evolutionary properties of primordial massive and very massive stars, supposed to have formed from metal-free gas. Stellar models are presented over a large range of…
A unified formalism for the core mass-luminosity relations of shell-burning stars
P. Marigo
The luminosity evolution of stars with highly condensed cores surrounded by nuclear-burning shell(s) is analytically investigated with the aid of homology relations. With respect t…
Is the core mass-luminosity relation violated by the occurrence of the third dredge-up ?
P. Marigo, L. Girardi, A. Weiss +1
The core mass-luminosity (Mc-L) relation of TP-AGB stars is a key ingredient in synthetic calculations of their evolution. Recently, Herwig et al. (1998) have presented full calcul…
Envelope burning over-luminosity: a challenge to synthetic TP-AGB models
Paola Marigo
Until recently synthetic AGB models had not taken into account the break-down of the core mass-luminosity (Mc-L) relation due to the occurrence of envelope burning in the most mass…