Results 11 to 20 of about 63,717 (277)

Lithium in Turnoff Stars in the Globular Cluster M5: A Quest for Primordial Lithium

The Astrophysical Journal, 2023
The light element lithium is formed by nucleosynthesis during the Big Bang. Its abundance can help to define the parameters of the early Universe. To find this primordial value, it is necessary to determine Li abundances in the oldest stars because it is
Ann Merchant Boesgaard, Constantine P. Deliyannis   +1 more
doaj   +1 more source

The Abundance of S-Process Elements: Temporal and Spatial Trends from Open Cluster Observations

Universe, 2022
Spectroscopic observations of stars belonging to open clusters, with well-determined ages and distances, are a unique tool for constraining stellar evolution, nucleosynthesis, mixing processes, and, ultimately, Galactic chemical evolution.
Laura Magrini, Carlos Viscasillas Vázquez, Giada Casali, Martina Baratella, Valentina D’Orazi, Lorenzo Spina, Sofia Randich, Sergio Cristallo, Diego Vescovi   +8 more
doaj   +1 more source

Stellar abundances of beryllium and CUBES [PDF]

, 2014
Stellar abundances of beryllium are useful in different areas of astrophysics, including studies of the Galactic chemical evolution, of stellar evolution, and of the formation of globular clusters.
Smiljanic, R.
core   +2 more sources

Stellar Nucleosynthesis in the Hyades Open Cluster [PDF]

, 2009
We report a comprehensive light element (Li, C, N, O, Na, Mg, and Al) abundance analysis of three solar-type main sequence (MS) dwarfs and three red giant branch (RGB) clump stars in the Hyades open cluster using high-resolution and high signal-to-noise ...
Allende Prieto, Armstrong, Arnett, Asplund, Böhm-Vitense, Carlsson, Clayton, Denissenkov, Duncan, El Eid, El Eid, Ferguson, Fitzpatrick, Gratton, Gratton, Gustafsson, Hamdani, Jacobson, Jacobson, Jeremy R. King, Kjaergaard, Kunz, Kupka, Lambert, Lih-Sin The, Luck, Mandell, Paulson, Piskunov, Rolfs, Ryabchikova, Schuler, Schuler, Schuler, Shetrone, Simon C. Schuler, Smith, Stürenburg, Takeda, Takeda, Takeda, Tautvaišiene, Taylor, The, The, Timmes, Varenne, Yi, Yong   +48 more
core   +3 more sources

Planetary nebulae abundances and stellar evolution II [PDF]

, 2010
Context: In recent years mid- and far infrared spectra of planetary nebulae have been analysed and lead to more accurate abundances. It may be expected that these better abundances lead to a better understanding of the evolution of these objects.
Asplund, Bernard-Salas, Bernard-Salas, Bernard-Salas, Blöcker, Cahn, Ciardullo, Crowther, Feldman, Gathier, Gathier, Gathier, Greig, Greig, Harris, Heap, Hummer, J. Bernard-Salas, Karakas, Manchado, Marigo, Martin, Matsuura, Mellema, Mendez, Mendez, Napiwotzki, Paczynski, Pauldrach, Peimbert, Peimbert, Phillips, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Pottasch, Preite-Martinez, Preite-Martinez, Renzini, S. R. Pottasch, Sabbadin, Sabbadin, Schönberner, Schönberner, Stanghellini, Stanghellini, Stoy, Tylenda, Vassiliadis, Wolff, Zijlstra   +59 more
core   +5 more sources

Stellar Iron Abundances at the Galactic Center [PDF]

, 2000
We present measurements of [Fe/H] for six M supergiant stars and three giant stars within 0.5 pc of the Galactic Center (GC) and one M supergiant star within 30 pc of the GC. The results are based on high-resolution (lambda / Delta lambda =40,000) K-band
Adam Steed, Donald M. Terndrup, Dyck H. M., Edmonds F. N., Gray D. F., Gummersbach C. A., Holweger H., Jenkins A., John S. Carr, K. Sellgren, Maciel W. J., Marigo P., Moneti A., Plez B., Plez B., Portinari L., Richichi A., Robert Blum, Ruland F., Schaerer D., Schaller G., Shaver P. A., Solange V. Ramirez, Stark A. A., Suchitra C. Balachandran, Takeda Y., Vilchez J. M.   +26 more
core   +2 more sources

Differential stellar population models: how to reliably measure [Fe/H] and [alpha/Fe] in galaxies [PDF]

, 2009
We present differential stellar population models, which allow improved determinations of the ages, iron and alpha-element abundances of old stellar populations from spectral fitting.
A. Gallazzi, Abazajian, Alves-Brito, Asari, Bensby, Bertone, Bruzual, C. J. Walcher, Catelan, Cervantes, Cid Fernandes, Coelho, Feltzing, Gallazzi, Koleva, Lawson, Le Borgne, Le Borgne, MacArthur, Martins, Meléndez, Ocvirk, P. Coelho, Panter, Percival, Prugniel, S. Charlot, Schiavon, Thomas, Tojeiro, Trager, Vazdekis, Vazdekis, Vázquez, Walcher, Walcher, Wild, Wolf, Worthey, Zoccali   +39 more
core   +1 more source

Stellar Parameters and Chemical Abundances Estimated from LAMOST-II DR8 MRS Based on Cycle-StarNet

The Astrophysical Journal Supplement Series, 2023
Deriving stellar atmospheric parameters and chemical abundances from stellar spectra is crucial for understanding the evolution of the Milky Way. By performing a fitting with MARCS model atmospheric theoretical synthetic spectra combined with a domain ...
Rui Wang, A-Li Luo, Shuo Zhang, Yuan-Sen Ting, Teaghan O’Briain, LAMOST MRS Collaboration   +5 more
doaj   +1 more source

Elemental Abundances in M31: Alpha and Iron Element Abundances from Low-Resolution Resolved Stellar Spectroscopy in the Stellar Halo [PDF]

, 2019
Measurements of [Fe/H] and [$\alpha$/Fe] can probe the minor merging history of a galaxy, providing a direct way to test the hierarchical assembly paradigm.
Cunningham, Emily C., Escala, Ivanna, Gilbert, Karoline M., Kirby, Evan N., Wojno, Jennifer   +4 more
core   +3 more sources

Nitrogen Production in Starburst Galaxies Detected by GALEX [PDF]

, 2007
We investigate the production of nitrogen in star-forming galaxies with ultraviolet (UV) radiation detected by the Galaxy Evolution Explorer Satellite (GALEX).
Barlow, Tom A., Bianchi, Luciana, Charlot, Stéphane, Donas, José, Forster, Karl, Friedman, Peter G., Heckman, Timothy M., Kewley, Lisa J., Lee, Young-Wook, Madore, Barry F., Mallery, Ryan P., Martin, D. Christopher, Milliard, Bruno, Morrissey, Patrick, Neff, Susan G., Rich, R. Michael, Salim, Samir, Schiminovich, David, Seibert, Mark, Small, Todd, Szalay, Alex S., Tremonti, Christy, Welsh, Barry Y., Wyder, Ted, Yi, Sukyoung   +24 more
core   +4 more sources