Results 61 to 70 of about 24,208 (239)

Two Micron‐Size Dark Dimensions

Fortschritte der Physik, Volume 73, Issue 8, August 2025.
Abstract Two extra dimensions of micron scale might simultaneously address the gauge and cosmological hierarchy problems. In this paper various observational bounds in scenarios with one and two large extra dimensions are examined, to see if they are compatible with the micron scale.
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lüst   +2 more
wiley   +1 more source

Underground Measurements of Nuclear Reaction Cross-Sections Relevant to AGB Stars

Universe, 2021
Nuclear reaction cross sections are essential ingredients to predict the evolution of AGB stars and understand their impact on the chemical evolution of our Galaxy.
Chemseddine Ananna, Francesco Barile, Axel Boeltzig, Carlo Giulio Bruno, Francesca Cavanna, Giovanni Francesco Ciani, Alessandro Compagnucci, Laszlo Csedreki, Rosanna Depalo, Federico Ferraro, Eliana Masha, Denise Piatti, David Rapagnani, Jakub Skowronski   +13 more
doaj   +1 more source

Predicted gamma-ray line emission from the Cygnus complex

, 2010
The Cygnus region harbours a huge complex of massive stars at a distance of 1.0-2.0kpc from us. About 170 O stars are distributed over several OB associations, among which the Cyg OB2 cluster is by far the most important with about 100-120 O stars. These
Camilo, Cash, Castor, Cerviño, Chu, Comerón, Comerón, Comerón, Daflon, Dame, del Rio, Diehl, Frail, G. Meynet, Harris, Hunter, Iwamoto, J. Knödlseder, Janssen, Kaplan, Karakas, Knödlseder, Knödlseder, Knödlseder, Kobulnicky, Langer, Le Duigou, Leitherer, Limongi, Lodders, Mac Low, Maeder, Manchester, Martin, Meynet, Meynet, Meynet, Nugis, P. Martin, Palacios, Plüschke, Prantzos, R. Diehl, Rugel, Salpeter, Schneider, Sutherland, Timmes, Tomisaka, Voss, Wang, Weaver, Wellstein, Wendker, Woosley, Woosley, Woosley   +56 more
core   +1 more source

The temperature and chronology of heavy-element synthesis in low-mass stars [PDF]

, 2015
Roughly half of the heavy elements (atomic mass greater than that of iron) are believed to be synthesized in the late evolutionary stages of stars with masses between 0.8 and 8 solar masses. Deep inside the star, nuclei (mainly iron) capture neutrons and
A Jorissen, A. Jorissen, B Gustafsson, B. Plez, CB Stephenson, DA Garcìa-Hernàndez, DL Lambert, E Biémont, E Vassiliadis, F Kupka, F Käppeler, F Käppeler, G Raskin, G Tagliente, G Wallerstein, GJ Mathews, K Takahashi, K-P Schröder, L Siess, L. Siess, M Asplund, MR Savina, O Straniero, O Trippella, P de Laverny, P. Neyskens, PW Merrill, R Alvarez, S Cristallo, S Goriely, S Goriely, S Van Eck, S Van Eck, S Van Eck, S Van Eck, S. Goriely, S. Van Eck, VV Smith, Y Kashiv, ZY Bao   +39 more
core   +2 more sources

Evolving R Coronae Borealis Stars with MESA [PDF]

, 2019
The R Coronae Borealis (RCB) stars are rare hydrogen--deficient, carbon--rich supergiants. They undergo extreme, irregular declines in brightness of many magnitudes due to the formation of thick clouds of carbon dust.
Chatzopoulos, Emmanouil, Clayton, Geoffrey C., Frank, Juhan, Lauer, Amber, Marcello, Dominic C.   +4 more
core   +3 more sources

Evolution and Nucleosynthesis of AGB stars in Three Magellanic Cloud Clusters

, 2011
We present stellar evolutionary sequences for asymptotic giant branch (AGB) stars in the Magellanic Cloud clusters NGC 1978, NGC 1846 and NGC 419. The new stellar models for the three clusters match the observed effective temperatures on the giant ...
A. I. Karakas, Bessell, Busso, Cannon, Charbonnel, Charbonnel, Cyburt, D. Kamath, Eggleton, Feast, Forestini, Frost, Gallino, Girardi, Girardi, Goriely, Goudfrooij, Groenewegen, Herwig, Herwig, Karakas, Liebert, Lloyd Evans, Lodders, Lugaro, Mackey, Marigo, Mowlavi, Mowlavi, Mucciarelli, Mucciarelli, Mucciarelli, Nordhaus, P. R. Wood, Stanghellini, Stanghellini, Straniero, Wang, Wood   +38 more
core   +1 more source

Pop III i-process nucleosynthesis and the elemental abundances of SMSS J0313-6708 and the most iron-poor stars [PDF]

, 2017
© 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. We have investigated a highly energetic H-ingestion event during shell He burning leading to H-burning luminosities of log (L H /L ⊙ ) ~ 13 in a 45M ...
Clarkson, O., Herwig, F., Pignatari, M.
core   +2 more sources

Can We Draw Conclusions on Supernova Shock Wave Propagation Using Short‐Lived Radioactive Isotopes?

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT We run a three‐dimensional Galactic chemical evolution (GCE) model to follow the propagation of 53Mn (exclusively produced from type Ia supernovae, SNIa), 60Fe (exclusively produced from core‐collapse supernovae, CCSNe), 182Hf (exclusively produced from intermediate mass stars, IMSs), and 244Pu (exclusively produced from neutron star mergers ...
Benjamin Wehmeyer, Andrés Yagüe López, Benoit Côté, Maria K. Petö, Chiaki Kobayashi, Maria Lugaro   +5 more
wiley   +1 more source

The Impact of Initial Composition on Massive Star Evolution and Nucleosynthesis

The Astrophysical Journal
We study the sensitivity of presupernova evolution and supernova nucleosynthesis yields of massive stars to variations of the initial composition. We use the solar abundances from Lodders, and compute two different sets of initial stellar compositions ...
Christopher West, Alexander Heger, Benoit Côté, Lev Serxner, Haoxuan Sun   +4 more
doaj   +1 more source

Application of Laboratory Atomic Physics to Some Significant Stellar Chemical Composition Questions

Atoms, 2018
This brief review highlights some current issues in Galactic stellar nucleosynthesis, and some recent laboratory studies by the Wisconsin atomic physics group that have direct application to stellar spectroscopy to advance our understanding of the ...
Christopher Sneden, James E. Lawler, Michael P. Wood   +2 more
doaj   +1 more source