Zobrazeno 1 - 10
of 927
pro vyhledávání: '"Abundances [Stars]"'
Akademický článek
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Akademický článek
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Autor:
R D Jeffries, R J Jackson, Nicholas J Wright, G Weaver, G Gilmore, S Randich, A Bragaglia, A J Korn, R Smiljanic, K Biazzo, A R Casey, A Frasca, A Gonneau, G Guiglion, L Morbidelli, L Prisinzano, G G Sacco, G Tautvaišienė, C C Worley, S Zaggia
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 523:802-824
We present an empirical model of age-dependent photospheric lithium depletion, calibrated using a large, homogeneously-analysed sample of 6200 stars in 52 open clusters, with ages from 2--6000 Myr and $-0.3
Accepted for publication in Monthly No
Accepted for publication in Monthly No
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac8292f25723f2a5ef1f6270a822e87f
https://doi.org/10.1093/mnras/stad1293
https://doi.org/10.1093/mnras/stad1293
Akademický článek
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Autor:
Gabriele Cescutti, Francesca Matteucci
Publikováno v:
Universe, Vol 8, Iss 3, p 173 (2022)
In this review, we discuss the impact of s-process nucleosynthesis in asymptotic giant branch stars on the enrichment of heavy elements. We review the main steps made on this subject in the last 40 years and discuss the importance of modelling the ev
Externí odkaz:
https://doaj.org/article/e54caeca7c94420d9d403e31e1fbe29d
Autor:
J S Thomsen, K Brogaard, T Arentoft, D Slumstrup, M N Lund, F Grundahl, A Miglio, J Jessen-Hansen, S Frandsen
Publikováno v:
Thomsen, J S, Brogaard, K, Arentoft, T, Slumstrup, D, Lund, M N, Grundahl, F, Miglio, A, Jessen-Hansen, J & Frandsen, S 2022, ' Establishing the accuracy of asteroseismic mass and radius estimates of giant stars-II. Revised stellar masses and radii for KIC 8430105 ', Monthly Notices of the Royal Astronomical Society, vol. 517, no. 3, pp. 4187-4201 . https://doi.org/10.1093/mnras/stac2942
Asteroseismic scaling relations can provide high-precision measurements of mass and radius for red giant (RG) stars displaying solar-like oscillations. Their accuracy can be validated and potentially improved using independent and accurate observatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95e7fbd96952990817a570d1f82f1545
https://doi.org/10.1093/mnras/stac2942
https://doi.org/10.1093/mnras/stac2942
The chemical transport mechanisms are key ingredients in stellar evolution. However, the computation of stellar models, used to characterize stars, often includes a simple atomic dif- fusion treatment, ignoring other additional processes, like the ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9d38029de00795d5e1cb6fccd77bfc2
Autor:
Wild James, Jeffery Christopher Simon
Publikováno v:
Open Astronomy, Vol 26, Iss 1, Pp 246-251 (2017)
High-resolution ultraviolet spectroscopy of two chemically peculiar hot subdwarfs, PG 0909+276 and UVO0512-08, has been obtained using the Hubble Space Telescope. Chemical abundances in the stars’ atmospheres were measured from previous optical spe
Externí odkaz:
https://doaj.org/article/0cb80f4eae7a4c0398c863d02fc68c93
Autor:
S. Nepal, G. Guiglion, R. S. de Jong, M. Valentini, C. Chiappini, M. Steinmetz, M. Ambrosch, E. Pancino, R. D. Jeffries, T. Bensby, D. Romano, R. Smiljanic, M. L. L. Dantas, G. Gilmore, S. Randich, A. Bayo, M. Bergemann, E. Franciosini, F. Jiménez-Esteban, P. Jofré, L. Morbidelli, G. G. Sacco, G. Tautvaišienė, S. Zaggia
Publikováno v:
Nepal, S, Guiglion, G, de Jong, R S, Valentini, M, Chiappini, C, Steinmetz, M, Ambrosch, M, Pancino, E, Jeffries, R D, Bensby, T, Romano, D, Smiljanic, R, Dantas, M L L, Gilmore, G, Randich, S, Bayo, A, Bergemann, M, Franciosini, E, Jimenez-Esteban, F, Jofre, P, Morbidelli, L, Sacco, G G, Tautvaisiene, G & Zaggia, S 2023, ' The Gaia-ESO Survey : Preparing the ground for 4MOST and WEAVE galactic surveys Chemical evolution of lithium with machine learning ', Astronomy & Astrophysics, vol. 671, A61 . https://doi.org/10.1051/0004-6361/202244765
With its origin coming from several sources (Big Bang, stars, cosmic rays) and given its strong depletion during its stellar lifetime, the lithium element is of great interest as its chemical evolution in the Milky Way is not well understood at prese
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69d8bc68c658389423c6c8fe650e829d
https://curis.ku.dk/ws/files/342498143/aa44765_22.pdf
https://curis.ku.dk/ws/files/342498143/aa44765_22.pdf
Autor:
Lagae, C., Amarsi, A. M., Díaz, L. F. Rodríguez, Lind, K., Nordlander, T., Hansen, T. T., Heger, A.
Publikováno v:
Lagae, C, Amarsi, A M, Rodríguez Díaz, L F, Lind, K, Nordlander, T, Hansen, T T & Heger, A 2023, ' Raising the observed metallicity floor with a 3D non-LTE analysis of SDSS J102915.14+172927.9 ', Astronomy and Astrophysics, vol. 672, A90 . https://doi.org/10.1051/0004-6361/202245786
Context: The first stars produced the first heavy elements and set the stage for the formation of the first galaxies. Accurate chemical abundances of ultra metal-poor stars ([Fe/H]
14 pages, 9 figures, Accepted for publication in Astronomy & Ast
14 pages, 9 figures, Accepted for publication in Astronomy & Ast
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16b929d8c0ae9a2ad134d0c14a3b4535
http://arxiv.org/abs/2303.01374
http://arxiv.org/abs/2303.01374