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Reaction rates for the s-process neutron source 22Ne+α
Richard Longland, Christian Iliadis, Amanda I. Karakas
The 22Ne(α,n)25Mg reaction is an important source of neutrons for the s-process. In massive stars responsible for the weak component of the s-process, 22Ne(α,n)25Mg is the dominant…
Heavy Element Nucleosynthesis in the Brightest Galactic Asymptotic Giant Branch stars
Amanda I. Karakas, D. A. García-Hernández, Maria Lugaro
We present updated calculations of stellar evolutionary sequences and detailed nucleosynthesis predictions for the brightest asymptotic giant branch (AGB) stars in the Galaxy with…
The remarkable solar twin HIP 56948: a prime target in the quest for other Earths
Jorge Melendez, Maria Bergemann, Judith G. Cohen +8
We study HIP 56948, the best solar twin known to date, to determine with an unparalleled precision how similar is to the Sun in its physical properties, chemical composition and pl…
Post-AGB stars in the SMC as tracers of stellar evolution: the extreme s-process enrichment of the 21 micrometer star J004441.04-732136.4
Kenneth De Smedt, Hans Van Winckel, Amanda I. Karakas +3
By virtue of their spectral types, favourable bolometric corrections as well as their constrained distances, post-AGB stars in external galaxies offer unprecedented tests to AGB nu…
Lithium abundances in CEMP stars
T. Masseron, J. A. Johnson, S. Lucatello +4
Carbon-enhanced metal-poor (CEMP) stars are believed to show the chemical imprints of more massive stars (M > 0.8 Msun) that are now extinct. In particular, it is expected that the…
Rubidium, zirconium, and lithium production in intermediate-mass asymptotic giant branch stars
Mark A. van Raai, M. Lugaro, Amanda I. Karakas +2
A recent survey of a large sample of Galactic intermediate-mass (>3 Msun) asymptotic giant branch (AGB) stars shows that they exhibit large overabundances of rubidium (Rb) up to 10…