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Browsing University of Hertfordshire by Author "Nordlander, T."
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The Gaia-ESO Survey : The analysis of high-resolution UVES spectra of FGK-type stars
Smiljanic, R.; Korn, A.J.; Bergemann, M.; Frasca, A.; Magrini, L.; Masseron, T.; Pancino, E.; Ruchti, G.; San Roman, I.; Sbordone, L.; Sousa, S.G.; Tabernero, H.; Tautvaišienė, G.; Valentini, M.; Weber, M.; Worley, C. C.; Adibekyan, V. Zh; Allende Prieto, C.; Barisevičius, G.; Biazzo, K.; Blanco-Cuaresma, S.; Bonifacio, P.; Bragaglia, A.; Caffau, E.; Cantat-Gaudin, T.; Chorniy, Y.; De Laverny, P.; Delgado-Mena, E.; Donati, P.; Duffau, S.; Franciosini, E.; Friel, E.; Geisler, D.; González Hernández, J. I.; Gruyters, P.; Guiglion, G.; Hansen, C. J.; Heiter, U.; Hill, V.; Jacobson, H. R.; Jofre, P.; Jönsson, H.; Lanzafame, A. C.; Lardo, C.; Ludwig, H. G.; Maiorca, E.; Mikolaitis, S.; Montes, D.; Morel, T.; Mucciarelli, A.; Munõz, C.; Nordlander, T.; Pasquini, L.; Puzeras, E.; Recio-Blanco, A.; Ryde, N.; Sacco, G.; Santos, N.C.; Serenelli, A. M.; Sordo, R.; Soubiran, C.; Spina, L.; Steffen, M.; Vallenari, A.; Van Eck, S.; Villanova, S.; Gilmore, G.; Randich, S.; Asplund, M.; Binney, J.; Drew, J.E.; Feltzing, S.; Ferguson, A.; Jeffries, R.; Micela, G.; Negueruela, I.; Prusti, T.; Rix, H. W.; Alfaro, E.; Babusiaux, C.; Bensby, T.; Blomme, R.; Flaccomio, E.; François, P.; Irwin, M.; Koposov, S.; Walton, N.; Bayo, A.; Carraro, G.; Costado, M. T.; Damiani, F.; Edvardsson, B.; Hourihane, A.; Jackson, R.; Lewis, J.; Lind, K.; Marconi, G.; Martayan, C.; Monaco, L.; Morbidelli, L.; Prisinzano, L.; Zaggia, S. (2014-11)Context. The ongoing Gaia-ESO Public Spectroscopic Survey is using FLAMES at the VLT to obtain high-quality medium-resolution Giraffe spectra for about 105 stars and high-resolution UVES spectra for about 5000 stars. With ... -
The GALAH Survey : Non-LTE departure coefficients for large spectroscopic surveys
Amarsi, A. M.; Lind, K.; Osorio, Y.; Nordlander, T.; Bergemann, M.; Reggiani, H.; Wang, E. X.; Buder, S.; Asplund, M.; Barklem, P. S.; Wehrhahn, A.; Skúladóttir, Á.; Kobayashi, C.; Karakas, A. I.; Gao, X. D.; Bland-Hawthorn, J.; Silva, G. M. De; Kos, J.; Lewis, G. F.; Martell, S. L.; Sharma, S.; Simpson, J. D.; Zucker, D. B.; Čotar, K.; Horner, J.; collaboration, the GALAH (2020-10-06)Massive sets of stellar spectroscopic observations are rapidly becoming available and these can be used to determine the chemical composition and evolution of the Galaxy with unprecedented precision. One of the major ... -
High resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1
Yong, D.; Costa, G. S. Da; Bessell, M. S.; Chiti, A.; Frebel, A.; Gao, X.; Lind, K.; Mackey, A. D.; Marino, A. F.; Murphy, S. J.; Nordlander, T.; Asplund, M.; Casey, A. R.; Kobayashi, C.; Norris, J. E.; Schmidt, B. P. (2021-11-01)We present chemical abundances for 21 elements (from Li to Eu) in 150 metal-poor Galactic stars spanning -4.1 < [Fe/H] < -2.1. The targets were selected from the SkyMapper survey and include 90 objects with [Fe/H] ≤ -3 of ... -
Non-LTE abundance corrections for late-type stars from 2000Å to 3μm I. Na, Mg, and Al
Lind, K.; Nordlander, T.; Wehrhahn, A.; Montelius, M.; Osorio, Y.; Barklem, P. S.; Afsar, M.; Sneden, C.; Kobayashi, C. (2022-09-28)It is well known that cool star atmospheres depart from local thermodynamic equilibrium (LTE). Accurate abundance determination requires taking those effects into account, but the necessary non-LTE calculations are often ... -
R-Process elements from magnetorotational hypernovae
Yong, D.; Kobayashi, C.; Costa, G. S. Da; Bessell, M. S.; Chiti, A.; Frebel, A.; Lind, K.; Mackey, A. D.; Nordlander, T.; Asplund, M.; Casey, A. R.; Marino, A. F.; Murphy, S. J.; Schmidt, B. P. (2021-07-08)Neutron-star mergers were recently confirmed as sites of rapid-neutron-capture (r-process) nucleosynthesis 1–3. However, in Galactic chemical evolution models, neutron-star mergers alone cannot reproduce the observed element ...