Zobrazeno 1 - 10
of 2 223
pro vyhledávání: '"Choplin, A"'
Asymptotic giant branch (AGB) stars can experience proton ingestion events (PIEs), leading to a rich nucleosynthesis. During a PIE, the intermediate neutron capture process (i-process) develops, leading to the production of trans-iron elements. It is
Externí odkaz:
http://arxiv.org/abs/2410.12630
J-type stars are a subclass of carbon stars that are generally Li-rich, not enriched in s-elements, and have low $^{12}$C/$^{13}$C ratios. They were suggested to be the manufacturers of the pre-solar grains of type AB2 (having low $^{12}$C/$^{13}$C a
Externí odkaz:
http://arxiv.org/abs/2410.10300
Autor:
Dumont, T., Monpribat, E., Courtin, S., Choplin, A., Bonhomme, A., Ekström, S., Heine, M., Curien, D., Nippert, J., Meynet, G.
Publikováno v:
A&A 688, A115 (2024)
Nuclear reactions drive the stellar evolution and contribute to the stellar and galactic chemicals abundances. New determinations of the nuclear reaction rates for key fusion reactions of stellar evolution are now available, paving the way to improve
Externí odkaz:
http://arxiv.org/abs/2404.18662
Autor:
Tsiatsiou, Sophie, Sibony, Yves, Nandal, Devesh, Sciarini, Luca, Hirai, Yutaka, Ekstrom, Sylvia, Farrell, Eoin, Murphy, Laura, Choplin, Arthur, Hirschi, Raphael, Chiappini, Cristina, Liu, Boyuan, Bromm, Volker, Groh, Jose, Meynet, Georges
Publikováno v:
A&A 687, A307 (2024)
The first stars might have been fast rotators. This would have important consequences for their radiative, mechanical and chemical feedback. We discuss the impact of fast initial rotation on the evolution of massive Population III models and on their
Externí odkaz:
http://arxiv.org/abs/2404.16512
The intermediate neutron capture process (i-process) can develop during proton ingestion events (PIE), potentially during the early stages of low-mass low-metallicity asymptotic giant branch (AGB) stars. We examine the impact of overshoot mixing on t
Externí odkaz:
http://arxiv.org/abs/2402.10284
Autor:
Nandal, Devesh, Meynet, Georges, Ekström, Sylvia, Moyano, Facundo D., Eggenberger, Patrick, Choplin, Arthur, Georgy, Cyril, Farrell, Eoin, Maeder, Andre
The physics of stellar rotation plays a crucial role in the evolution of stars, their final fate and the properties of compact remnants. Diverse approaches have been adopted to incorporate the effects of rotation in stellar evolution models. This stu
Externí odkaz:
http://arxiv.org/abs/2312.13340
Autor:
Markova, M., Larsen, A. C., von Neumann-Cosel, P., Litvinova, E., Choplin, A., Goriely, S., Martinet, S., Siess, L., Guttormsen, M., Pogliano, F., Siem, S.
The $\gamma$-ray strength functions (GSF) and nuclear level densities (NLD) below the neutron threshold have been extracted for $^{111-113,116-122,124}$Sn from particle-$\gamma$ coincidence data with the Oslo method. The evolution of bulk properties
Externí odkaz:
http://arxiv.org/abs/2311.08864
We investigate both the systematic and statistical uncertainties associated with theoretical nuclear reaction rates of relevance during the i-process and explore their impact on the i-process elemental production, and subsequently on the surface enri
Externí odkaz:
http://arxiv.org/abs/2310.08694
Autor:
Ingeberg, V. W., Siem, S., Wiedeking, M., Choplin, A., Goriely, S., Siess, L., Abrahams, K. J., Arnswald, K., Garrote, F. Bello, Bleuel, D. L., Cederkäll, J., Christoffersen, T. L., Cox, D. M., De Witte, H., Gaffney, L. P., Görgen, A., Henrich, C., Illana, A., Jones, P., Kheswa, B. V., Kröll, T., Majola, S. N. T., Malatji, K. L., Ojala, J., Pakarinen, J., Rainovski, G., Reiter, P., von Schmid, M., Seidlitz, M., Tveten, G. M., Warr, N., Zeiser, F.
Proton-$\gamma$ coincidences from $(\mathrm{d},\mathrm{p})$ reactions between a $^{66}\mathrm{Ni}$ beam and a deuterated polyethylene target have been analyzed with the inverse-Oslo method to find the nuclear level density (NLD) and $\gamma$-ray stre
Externí odkaz:
http://arxiv.org/abs/2307.07153
Autor:
Karinkuzhi, D., Van Eck, S., Goriely, S., Siess, L., Jorissen, A., Choplin, A., Escorza, A., Shetye, S., Van Winckel, H.
Publikováno v:
A&A 677, A47 (2023)
A sample of 895 s-process-rich candidates has been found among the 454180 giant stars surveyed by LAMOST at low spectral resolution (R~1800). In a previous study, taking advantage of the higher resolution (R~86 000) offered by the the HERMES-Mercator
Externí odkaz:
http://arxiv.org/abs/2305.04189