Zobrazeno 1 - 10
of 5 875
pro vyhledávání: '"Charbonnel, A."'
Publikováno v:
A&A 691, A142 (2024)
Lithium plays a crucial role in probing stellar physics and stellar and primordial nucleosynthesis, as well as the chemical evolution of our Galaxy. Stars are considered to be the main source of Li, still the identity of its primary stellar producer
Externí odkaz:
http://arxiv.org/abs/2410.01880
Autor:
Nowak, Katarzyna, Krause, Martin G. H., Siegert, Thomas, Forbrich, Jan, Yates, Robert M., Ramírez-Galeano, Laura, Charbonnel, Corinne, Gieles, Mark
Self-enrichment is one of the leading explanations for chemical anomalies in globular clusters. In this scenario, various candidate polluter stars have been proposed to eject gas with altered chemical composition during the self-enrichment process. M
Externí odkaz:
http://arxiv.org/abs/2409.16362
This paper presents a first implementation of the LArge Time INcrement (LATIN) method along with the model reduction technique called Proper Generalized Decomposition (PGD) for solving nonlinear low-frequency dynamics problems when dealing with a qua
Externí odkaz:
http://arxiv.org/abs/2408.05108
Autor:
Konstantinova-Antova, Renada, Georgiev, Stefan, Lèbre, Agnès, Charbonnel, Corinne, Palacios, Ana, Aurière, Michel
During the last decade and a half, the new generation spectropolarimeter Narval at Pic du Midi, France allowed the study of weak magnetic fields in cool giant stars that are fairly evolved after main sequence. We present a short summary on the recent
Externí odkaz:
http://arxiv.org/abs/2407.17421
Autor:
Costa, G., Dumont, T., Lançon, A., Palacios, A., Charbonnel, C., Prugniel, P., Ekstrom, S., Georgy, C., Branco, V., Coelho, P., Martins, L., Borisov, S., Voggel, K., Chantereau, W.
Publikováno v:
A&A 690, A22 (2024)
A common property of globular clusters (GC) is to host multiple populations characterized by peculiar chemical abundances. Recent photometric studies suggest that the He content could vary between the populations of a GC by up to $\Delta$He $\sim$ 0.
Externí odkaz:
http://arxiv.org/abs/2405.16505
Publikováno v:
A&A 690, A245 (2024)
Unraveling the cosmological Li problem - the discrepancy between Big Bang nucleosynthesis predictions and observed values in the Spite plateau - requires a comprehensive exploration of stellar evolution. In this study, we utilized the code STAREVOL t
Externí odkaz:
http://arxiv.org/abs/2403.15534
Autor:
Merc, Jaroslav, Velez, Peter, Charbonnel, Stéphane, Garde, Olivier, Dû, Pascal Le, Mulato, Lionel, Petit, Thomas, Skowron, Jan
The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data
Externí odkaz:
http://arxiv.org/abs/2403.14313
Autor:
Lagarde, N., Minkeviciute, R., Drazdauskas, A., Tautvaisiene, G., Charbonnel, C., Reylé, C., Miglio, A., Kushwahaa, T., Bale, B.
Despite a rich observational background, few spectroscopic studies have dealt with the measurement of the carbon isotopic ratio in giant stars. However, it is a key element in understanding the mixing mechanisms that occur in the interiors of giant s
Externí odkaz:
http://arxiv.org/abs/2312.08197
Autor:
Kenworthy, Matthew, Lock, Simon, Kennedy, Grant, van Capelleveen, Richelle, Mamajek, Eric, Carone, Ludmila, Hambsch, Franz-Josef, Masiero, Joseph, Mainzer, Amy, Kirkpatrick, J. Davy, Gomez, Edward, Leinhardt, Zoë, Dou, Jingyao, Tanna, Pavan, Sainio, Arttu, Barker, Hamish, Charbonnel, Stéphane, Garde, Olivier, Dû, Pascal Le, Mulato, Lionel, Petit, Thomas, Smith, Michael Rizzo
Publikováno v:
2023, Nature, 622, 251-254. Published 2023 October 11 at https://www.nature.com/articles/s41586-023-06573-9
Planets grow in rotating disks of dust and gas around forming stars, some of which can subsequently collide in giant impacts after the gas component is removed from the disk. Monitoring programs with the warm Spitzer mission have recorded significant
Externí odkaz:
http://arxiv.org/abs/2310.08360
Autor:
Marques-Chaves, R., Schaerer, D., Kuruvanthodi, A., Korber, D., Prantzos, N., Charbonnel, C., Weibel, A., Izotov, Y. I., Messa, M., Brammer, G., Dessauges-Zavadsky, M., Oesch, P.
Publikováno v:
A&A 681, A30 (2024)
[Abridged] Using the JWST/NIRSpec observations from CEERS we found an extreme N-emitter, CEERS-1019 at z=8.6782 showing intense NIV and NIII emission. From the observed rest-UV and optical lines we conclude that it is compatible with photoionization
Externí odkaz:
http://arxiv.org/abs/2307.04234