Stellar contribution: low and intermediate mass stars
- Maurizio Busso (INFN Perugia)
24. Observational constraints on nucleosynthesis from AGB and post-AGB stars in our Galaxy and its satellites
Carlos Abia (Universidad de Granada)
The chemical analysis of the envelopes of AGB and post-AGB stars provide a valuable tool to study the late phases of the evolution of low and intermediate mass stars. Depending on stellar mass and metallicity the resulting abundance patterns exhibit characteristic features, which provide information on the nucleosynthesis processes occurring in the interior of these stars, and on their role in...
Sergio Cristallo (INAF - OAA)
Low mass Asymptotic Giant Branch stars are among the most important polluters of the interstellar medium. In their interiors, the main component (A>90) of the slow neutron capture process (the s-process) is synthesized, the most important neutron source being the 13C(a,n)16O reaction. I will present a theoretical sensitivity study (with variation up to a factor of two with respect to a...
Carolyn Doherty (Konkoly Observatory)
Super asymptotic giant branch (super-AGB) stars reside in the mass range approx 6-12 Msun and bridge the divide between low/intermediate-mass and massive stars. They are characterised by off-centre carbon ignition prior to a thermally pulsing phase which can consist of many 10-1000s of thermal pulses. Super-AGB stars undergo a variety of nucleosynthetic processes including proton-capture...
Sara Palmerini (INFN Perugia)
In the past years the observational evidence that s-process elements from Sr to Pb are produced by stars ascending the so-called Asymptotic Giant Branch (or ‘‘AGB”) could not be explained by self-consistent models, forcing researchers to extensive parameterizations. The crucial point is to understand how protons can be injected from the envelope into the He-rich layers, yielding the formation...
33. The evolution of CNO isotope ratios: a litmus test for stellar IMF variations in galaxies across cosmic time
Donatella Romano (INAF, Astrophysics and Space Science Observatory, Bologna)
Determining the shape of the stellar initial mass function (IMF), and whether it is constant or varies in a range of environments, is the Holy Grail of modern astrophysics, because of its profound implications for the theories of stars and galaxy formation. On a theoretical ground, it is expected that the extreme conditions for star formation encountered in the most powerful starburst events...