The 13th Torino Workshop on AGB stars & the 3rd Perugia Workshop on Nuclear Astrophysics

Session

Stellar Nucleosynthesis

23 Jun 2022, 09:00

Conveners

Stellar Nucleosynthesis

• Paolo Ventura (Istituto Nazionale di Fisica Nucleare)

Stellar Nucleosynthesis

• Paolo Ventura (Istituto Nazionale di Fisica Nucleare)

74. How important are Asymptotic Giant Branch Star in Astrophysics? (R)

Mounib EL EID (American University of Beirut (AUB))

23/06/2022, 09:00

Oral (remotely)

Asymptotic giant branch stars (AGB) represent an important phase in stellar evolution, because of the important physical processes involved in describing their internal structure and evolution. About half of the heavy elements beyond iron were produced during their peculiar evolutionary phases. Furthermore, the diversity of the nuclear processes determining the nucleosynthesis in these stars...

18. The NuGrid AGB Evolution and Nucleosynthesis Data Set

Umberto BATTINO (University of Hull)

23/06/2022, 09:25

Oral (in presence)

Asymptotic Giant Branch (AGB) stars play a key role in the chemical evolution of galaxies. These stars are the fundamental stellar site for the production of light elements such as C, N and F, and half of the elements heavier than Fe via the slow neutron capture process ($s$-process). Hence, detailed computational models of AGB stars’ evolution and nucleosynthesis are essential for...

16. Mixing by internal gravity waves and its possible roles in the origin of the Li-rich red-clump stars and formation of the $^{13}$C pocket in AGB stars

Pavel DENISENKOV (University of Victoria)

23/06/2022, 09:50

Oral (in presence)

The observed evolutionary decrease of the $^{12}$C/$^{13}$C isotopic ratio,
Li and C abundances, accompanied by the increase of the N
abundance, in low-mass stars on the upper RGB is caused by
extra mixing in their radiative zones. Multi-dimensional
hydrodynamic simulations of thermohaline convection have
demonstrated that its rate of mixing is almost two orders of
magnitude as low as...

20. Magnetic mixing and s-processing in AGB stars

Diego VESCOVI (Goethe University Frankfurt)

23/06/2022, 10:15

Oral (in presence)

Asymptotic giant branch stars are major sources of heavy elements in the Universe.
Despite the huge progress made in the last decades in the theoretical modeling of these objects, mixing processes occurring in their interiors are quite uncertain, especially the physical mechanism leading to the formation of the $^{13}$C pocket. Here, I will present recent results from the new generation of...

55. Barium stars as tracers of s-process nucleosynthesis in AGB stars (R)

Borbála CSEH (Konkoly Observatory, MTA CSFK)

23/06/2022, 11:10

Oral (remotely)

The Barium (Ba) star phenomenon is unmissable from the study and understanding of nucleosynthetic processes occuring in AGB stars. Ba stars belong to binary systems, where the former AGB polluted the companion, a less evolved star, which became enriched with material produced through the slow neutron capture process (s process). While the AGB has evolved to a white dwarf, the currently...

53. Finding the polluter AGB properties of a Barium stars with machine learning

Blanka VILÁGOS (Konkoly Observatory (ELKH CSFK), Eötvös Loránd University)

23/06/2022, 11:35

Oral (in presence)

The use of machine learning techniques in astronomy is becoming more and more widespread. Here I present our results on using machine learning (ML) methods for the comparison of observed Barium (Ba) star abundances and the predictions of AGB nucleosynthesis codes. This way, we can provide an estimate of the progenitor mass and metallicity of the former polluter AGB star that in the past...

8. The intermediate neutron capture process in AGB stars

Arthur CHOPLIN (Université Libre de Bruxelles)

23/06/2022, 12:00

Oral (in presence)

Despite considerable progresses over the past few decades, the origin of trans-iron elements is not yet fully understood. In addition to the slow (s) and rapid (r) neutron capture processes, an intermediate neutron capture process (i-process) is thought to exist at neutron densities intermediate between the s- and r-processes. The existence of this process is supported by the observation of...

34. Neutron capture nucleosynthesis in zero and very low metallicity rotating massive stars

Lorenzo ROBERTI (Konkoly Observatory, CSFK)

23/06/2022, 12:25

Oral (remotely)

In the last years observations of Fe-poor stars have made possible to have detailed measurements of their surface chemical composition. These objects are the perfect laboratories in which is possible to investigate the differences among the possible astrophysical sites of element production, from the lightest ones to the neutron capture elements. In fact, iron poor stars probably formed during...