Results 21 to 30 of about 64,475 (321)

Stellar Oxygen Abundances [PDF]

Publications of the Astronomical Society of the Pacific, 1994
This dissertation addresses several issues concerning stellar oxygen abundances. The 7774 {A} O I triplet equivalent widths of Abia & Rebolo [1989, AJ, 347, 186] for metal-poor dwarfs are found to be systematically too high. I also argue that current effective temperatures used in halo star abundance studies may be ~150 K too low.
openaire   +1 more source

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

Uncertainties in Stellar Abundance Analyses [PDF]

Highlights of Astronomy, 2005
AbstractOver the last half-century quantitative stellar spectroscopy has made great progress. However, most stellar abundance analyses today still employ rather simplified models, which can introduce severe systematic errors swamping the observational errors.
openaire   +2 more sources

Stellar Abundances: Better Measured Than Predicted [PDF]

Physics, 2013
The masses of exotic nuclei must be measured or calculated very precisely to explain how they led to the formation of heavy elements.
S. Kreim
openalex   +3 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 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

Abundances in Stellar Populations [PDF]

Symposium - International Astronomical Union, 1976
Stellar abundances are reviewed with emphasis on large-scale effects which may yield clues to galactic structure and evolution. Spectroscopic and indirect photoelectric abundance criteria are discussed, and utilized.The abundance statistics of nearby galactic disk stars, dominated by M dwarfs, but observed at spectral types F and GV and K III, suggest ...
openaire   +1 more source

Chemical abundances of the Typhon stellar stream

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT We present the first high-resolution chemical abundances of seven stars in the recently discovered high-energy stream Typhon. Typhon stars have apocentres r ≳ 100 kpc, making this the first detailed chemical picture of the Milky Way’s very distant stellar halo.
Alexander P Ji, Rohan P Naidu, Kaley Brauer, Yuan-Sen Ting, Joshua D Simon   +4 more
openaire   +2 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 Abundance Observations

, 1998
10 pages, 6 figures To appear in the Proceedings of the Second Oak Ridge Symposium on Atomic & Nuclear ...
Cowan, John J, Sneden, Christopher, Truran, James W, Burris, Debra L   +3 more
openaire   +2 more sources