Zobrazeno 1 - 10
of 106
pro vyhledávání: '"Nils Ryde"'
Autor:
Govind Nandakumar, Nils Ryde, Gregory Mace, Kyle F. Kaplan, Niels Nieuwmunster, Daniel Jaffe, R. Michael Rich, Mathias Schultheis, Oscar Agertz, Eric Andersson, Christopher Sneden, Emily Strickland, Brian Thorsbro
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 1, p 96 (2024)
We report the first high-resolution, detailed abundances of 21 elements for giants in the Galactic bulge/bar within 1° of the Galactic plane, where high extinction has rendered such studies challenging. Our high-signal-to-noise-ratio and high-resolu
Externí odkaz:
https://doaj.org/article/bf5f45303b7749b9adcb30db679f884c
Autor:
Oscar Agertz, Justin I. Read, Martin P. Rey, Nils Ryde, Florent Renaud, Eric P. Andersson, Thomas Bensby, Diane Feuillet
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 503:5846-5867
Using the VINTERGATAN cosmological zoom simulation, we explore the contributions of the in situ and accreted material, and the effect of galaxy interactions and mergers in the assembly of a Milky Way-like galaxy. We find that the initial growth phase
Autor:
Martin Asplund, Nils Ryde, Paul S. Barklem, Andrew R. Casey, Bengt Edvardsson, Henrik Jönsson, A. C. Lanzafame, Andreas Korn, Šarūnas Mikolaitis, L. Morbidelli, Gerard Gilmore, Maria Bergemann, E. Pancino, Lorenzo Monaco, Ulrike Heiter, Francesco Damiani, P. de Laverny, Clare Worley, Laura Magrini, Carmela Lardo, Paula Jofre, Sofia Feltzing, Simone Zaggia, Thomas Bensby, A. Bayo Aran, Rodolfo Smiljanic, Sofia Randich, Karin Lind, Juliet C. Pickering, Thomas Masseron
Publikováno v:
Astronomy & Astrophysics
We describe the atomic and molecular data that were used for the abundance analyses of FGK-type stars carried out within the Gaia-ESO Survey. We present an unprecedented effort to create a homogeneous line list, which was used by several abundance an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::97e7ee434ae4949a1fb410a72b7fb16b
Autor:
Jerome A. Orosz, J. R. Larsen, Robert D. Mathieu, C. T. G. Sørensen, S. T. Bjørn, Dennis Stello, J. H. Jørgensen, Karsten Brogaard, Imants Platais, J. B. Thomsen, T. Arentoft, Jens Jessen-Hansen, D. Slumstrup, Soren Meibom, S. Frandsen, M. L. Jensen, F. Grundahl, Nils Ryde, Aaron M. Geller, Eric L. Sandquist, Hans Bruntt
Publikováno v:
Brogaard, K, Grundahl, F, Sandquist, E L, Slumstrup, D, Thomsen, J B, Jørgensen, J H, Larsen, J R, Bjørn, S T, Sørensen, C T G, Bruntt, H, Arentoft, T, Frandsen, S, Jessen-Hansen, J, Orosz, J A, Mathieu, R, Geller, A, Ryde, N, Stello, D, Meibom, S, Platais, I & Jensen, M L 2021, ' Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members : III. Constraints from a subgiant ', Astronomy and Astrophysics, vol. 649, A178 . https://doi.org/10.1051/0004-6361/202140911
Models of stellar structure and evolution can be constrained using accurate measurements of the parameters of eclipsing binary members of open clusters. Multiple binary stars provide the means to tighten the constraints and, in turn, to improve the p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::538dbef74f0fd029f67d464ca31c41d0
https://pure.au.dk/portal/da/publications/age-and-helium-content-of-the-open-cluster-ngc-6791-from-multiple-eclipsing-binary-members(e4986b0a-6324-48bc-a4ab-a86d9233efc5).html
https://pure.au.dk/portal/da/publications/age-and-helium-content-of-the-open-cluster-ngc-6791-from-multiple-eclipsing-binary-members(e4986b0a-6324-48bc-a4ab-a86d9233efc5).html
Autor:
Graham M. Harper, Nils Ryde
Publikováno v:
Nature Astronomy. 5:1212-1213
A fluorine abundance measurement in a high-redshift galaxy demonstrates an early, quick rise in chemical enrichment of the Universe. The presence of fluorine at this early epoch also reveals a unique early source of the element.
Autor:
Nils Ryde
Publikováno v:
Journal of Astrophysics and Astronomy. 41
The cosmic origin of fluorine, the ninth element of the Periodic Table, is still under debate. The reason for this fact is the large difficulties in observing stellar diagnostic lines, which can be used for the determination of the fluorine abundance
Publikováno v:
Grisoni, V, Romano, D, Spitoni, E, Matteucci, F, Ryde, N & Jönsson, H 2020, ' Fluorine in the solar neighbourhood: modelling the Galactic thick and thin discs ', Monthly Notices of the Royal Astronomical Society, vol. 498, no. 1, pp. 1252-1258 . https://doi.org/10.1093/mnras/staa2316
We investigate the evolution of the abundance of fluorine in the Milky Way thick and thin discs by means of detailed chemical evolution models compared with recent observational data. The chemical evolution models adopted here have already been shown
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd4aa96768435f0b965f39dbe38b88b6
http://arxiv.org/abs/2008.00812
http://arxiv.org/abs/2008.00812
Autor:
Verne V. Smith, Kyle F. Kaplan, Henrik Jönsson, Gregory N. Mace, B. Thorsbro, E. Spitoni, Rebecca Forsberg, Heeyoung Oh, Benjamin Kidder, Daniel T. Jaffe, E. Strickland, Nils Ryde, Kimberly R. Sokal, Christopher Sneden, Katia Cunha, Jae-Joon Lee, Melike Afşar
Publikováno v:
Ryde, N, Jönsson, H, Mace, G, Cunha, K, Spitoni, E, Afşar, M, Jaffe, D, Forsberg, R, Kaplan, K F, Kidder, B T, Lee, J-J, Oh, H, Smith, V V, Sneden, C, Sokal, K R, Strickland, E & Thorsbro, B 2020, ' Fluorine in the Solar Neighborhood: the Need for Several Cosmic Sources ', The Astrophysical Journal, vol. 893, no. 1, 37 . https://doi.org/10.3847/1538-4357/ab7eb1
The cosmic origin of fluorine is still not well constrained. Several nucleosynthetic channels at different phases of stellar evolution have been suggested, but these must be constrained by observations. For this, the fluorine abundance trend with met
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db2e4bc115f7be457cabbf3e9160651b
http://arxiv.org/abs/2003.04656
http://arxiv.org/abs/2003.04656
Autor:
Thomas Bensby, Eric P. Andersson, Martin P. Rey, Nils Ryde, Justin I. Read, Sofia Feltzing, Diane Feuillet, Florent Renaud, Oscar Agertz
Spectroscopic surveys of the Milky Way's stars have revealed spatial, chemical and kinematical structures that encode its history. In this work, we study their origins using a cosmological zoom simulation, VINTERGATAN, of a Milky Way-mass disc galaxy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e51871cdc6a32b1936bbdd683c6adb40
Autor:
Mathias Schultheis, T. K. Fritz, Francesca Matteucci, E. Spitoni, R. M. Rich, B. Thorsbro, Nils Ryde, Florent Renaud, Rainer Schödel, Alessandra Mastrobuono-Battisti, Livia Origlia
Publikováno v:
Thorsbro, B, Ryde, N, Rich, R M, Schultheis, M, Renaud, F, Spitoni, E, Fritz, T K, Mastrobuono-Battisti, A, Origlia, L, Matteucci, F & Schödel, R 2020, ' Detailed Abundances in the Galactic Center: Evidence of a Metal-rich Alpha-enhanced Stellar Population ', The Astrophysical Journal, vol. 894, no. 1, 26 . https://doi.org/10.3847/1538-4357/ab8226
Digital.CSIC. Repositorio Institucional del CSIC
instname
Digital.CSIC. Repositorio Institucional del CSIC
instname
We present a detailed study of the composition of 20 M giants in the Galactic center with 15 of them confirmed to be in the nuclear star cluster. As a control sample we have also observed 7 M giants in the Milky Way disk with similar stellar paramete
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44558269ab5b2e7aaff4b6cdfff8563c
https://hdl.handle.net/11368/2972972
https://hdl.handle.net/11368/2972972