Zobrazeno 1 - 10
of 120
pro vyhledávání: '"Junqueira S"'
Autor:
Roriz, M. P., Holanda, N., da Conceição, L. V., Junqueira, S., Drake, N. A., Sonally, A., Pereira, C. B.
A classical Local Thermodynamic Equilibrium analysis, based on high-resolution spectroscopic data, is performed for a sample of three potential barium dwarf candidates and one star already recognized as such. We derived their atmospheric parameters,
Externí odkaz:
http://arxiv.org/abs/2402.14709
Autor:
Hartogh, J. W. den, López, A. Yagüe, Cseh, B., Pignatari, M., Világos, B., Roriz, M. P., Pereira, C. B., Drake, N. A., Junqueira, S., Lugaro, M.
Publikováno v:
A&A 672, A143 (2023)
We aim to analyse the abundance pattern of 169 Barium (Ba) stars, using machine learning techniques and the AGB final surface abundances predicted by Fruity and Monash stellar models. We developed machine learning algorithms that use the abundance pa
Externí odkaz:
http://arxiv.org/abs/2212.03593
We present detailed chemical compositions of four stars on the first-ascent red giant branch that are classified as chemically peculiar, but lack comprehensive analyses at high spectral resolution. For BD+03{\deg}2688, HE 0457-1805, HE 1255-2324, and
Externí odkaz:
http://arxiv.org/abs/2211.08627
Autor:
Cseh, B., Világos, B., Roriz, M. P., Pereira, C. B., D'Orazi, V., Karakas, A. I., Soós, B., Drake, N. A., Junqueira, S., Lugaro, M.
Publikováno v:
A&A 660, A128 (2022)
Barium (Ba) stars are polluted by material enriched in the slow neutron capture (s-process) elements synthesised in the interior of their former asymptotic giant branch (AGB) companion star, which is now a white dwarf. We compare individual Ba star a
Externí odkaz:
http://arxiv.org/abs/2201.13379
Autor:
Roriz, M. P., Lugaro, M., Pereira, C. B., Sneden, C., Junqueira, S., Karakas, A. I., Drake, N. A.
New elemental abundances for the neutron-capture elements Sr, Nb, Mo, Ru, La, Sm, and Eu are presented for a large sample of 180 barium (Ba) giant stars, a class of chemically peculiar objects that exhibit in their spectra enhancements of the element
Externí odkaz:
http://arxiv.org/abs/2108.08132
Akademický článek
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Akademický článek
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Autor:
Chan, R., Junqueira, S.
We present the results of several detailed numerical N-body simulations of the dynamical interactions of two equal mass disc galaxies. Both galaxies are embedded in spherical halos of dark matter and contain central bulges. Our analysis of the dynami
Externí odkaz:
http://arxiv.org/abs/1309.5456
Publikováno v:
Monthly Notices of the Royal Astronomical Society; Jan2024, Vol. 527 Issue 1, p1389-1404, 16p
Autor:
Junqueira, S., Combes, F.
Publikováno v:
accepted for publication in A&A
We report the results of self-gravitating simulations of spiral galaxies, modeled by stellar and gaseous components, developed to investigate in particular the role of dissipation in the evolution of galaxy disks. The gas disk is simulated by the Bea
Externí odkaz:
http://arxiv.org/abs/astro-ph/9603043