Results 51 to 60 of about 158,293 (319)

Extremely metal-poor stars from the SDSS [PDF]

Physica Scripta, 2008
6 pages, 6 figures, Proceedings paper of the conference "A stellar journey: A symposium in celebration of Bengt Gustafsson's 65th birthday"
Ludwig, Hans-Günter, Bonifacio, Piercarlo, Caffau, Elisabetta, Behara, Natalie, González Hernández, J. I., Sbordone, Luca   +5 more
openaire   +6 more sources

Origins of carbon-enhanced metal-poor stars [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
AbstractWe investigate the nature of carbon-enhanced metal-poor (CEMP) stars in Milky Way (MW) analogues selected from the eagle cosmological hydrodynamical simulation. The stellar evolution model in eagle includes the physics of enrichment by asymptotic giant branch (AGB) stars, winds from massive stars, and Type Ia and Type II supernovae (SNe).
Mahavir Sharma, Tom Theuns, Carlos S. Frenk, Ryan J. Cooke   +3 more
openaire   +4 more sources

The Na-O anticorrelation in horizontal branch stars. IV. M22 [PDF]

, 2014
We obtained high-resolution spectra for 94 candidate stars belonging to the HB of M22 with FLAMES.
Bragaglia, A., Carretta, E., Cassisi, S., D'Orazi, V., Gratton, R. G., Lucatello, S., Momany, Y., Salaris, M., Sollima, A., Stetson, P. B.   +9 more
core   +3 more sources

Chemical abundances in 43 metal-poor stars [PDF]

Proceedings of the International Astronomical Union, 2005
A&A LaTeX, 24 pages, 18 b/w figures.
Jonsell, K, Edvardsson, B, Gustafsson, Bengt, Magain, P, Nissen, Poul E, Asplund, Martin   +5 more
openaire   +7 more sources

Understanding the Early Stages of Galaxy Formation Using Very Metal-poor Stars from the Hamburg/ESO Survey

The Astrophysical Journal, 2023
We explore the chemodynamical properties of a sample of very metal-poor (VMP) stars selected from the Hamburg/ESO survey, matched with Gaia EDR3, in the phase space identified by the three integrals of motion ( L _z , E , I _3 ). Disk and halo orbits are
Daniela Carollo, Norbert Christlieb, Patricia B. Tissera, Emanuel Sillero   +3 more
doaj   +1 more source

Extremely metal‐poor stars in SDSS fields [PDF]

Astronomische Nachrichten, 2011
AbstractSome insight on the first generation of stars can be obtained from the chemical composition of their direct descendants, extremely metal‐poor stars (EMP), with metallicity less than or equal to 1/1000 of the solar metallicity. Such stars are exceedingly rare, the most successful surveys, for this purpose, have so far provided only about 100 ...
Sofia Randich, Mario Nonino, Roger Cayrel, P. Molaro, Piercarlo Bonifacio, Simone Zaggia, Hans-G. Ludwig, Hans-G. Ludwig, Francois Hammer, François Spite, Vanessa Hill, Beate Stelzer, Monique Spite, Luca Sbordone, Patrick Francois, Patrick Francois, Elisabetta Caffau   +16 more
openaire   +4 more sources

The Abundance of Lead in Four Metal-poor Stars [PDF]

The Astrophysical Journal Letters, 2021
Abstract Cowan et al. review how roughly half the elements heavier than iron found in the Sun are produced by rapid neutron capture and half by slow neutron capture, the r- and s-processes. In the Sun, their relative contribution to individual elemental abundances is well understood, except for the lightest and heaviest elements beyond ...
openaire   +4 more sources

The Most Metal-Poor Stars. II. Chemical Abundances of 190 Metal-Poor Stars Including 10 New Stars With [Fe/H] < -3.5 [PDF]

, 2012
We present a homogeneous chemical abundance analysis of 16 elements in 190 metal-poor Galactic halo stars (38 program and 152 literature objects). The sample includes 171 stars with [Fe/H] < -2.5, of which 86 are extremely metal poor, [Fe/H] < -3.0.
Abazajian, Alvarez, Anna Frebel, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Carretta, Castelli, Christlieb, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cristallo, David Yong, Demarque, Frebel, Frebel, Fulbright, Griffin, Gustafsson, Heger, Hollek, Honda, Ito, Ivans, John E. Norris, Johnson, Johnson, Kobayashi, Kobayashi, Kobayashi, Korn, Korn, Kurucz, Lai, Lai, Limongi, Limongi, Lucatello, Lugaro, M. Asplund, M. S. Bessell, McWilliam, N. Christlieb, Nissen, Nissen, Norris, Norris, Norris, Norris, Norris, P. S. Barklem, Ramírez, Richard, Richard, Roederer, Roederer, Ryan, S. G. Ryan, Sbordone, Skrutskie, Sobeck, Stephens, Suda, Taylor, Thévenin, Timothy C. Beers, Tominaga, Travaglio, Umeda, Venn, Wisotzki, Zhao   +79 more
core   +3 more sources

Very Metal-poor Stars in the Outer Galactic Bulge Found by the Apogee Survey [PDF]

, 2013
Despite its importance for understanding the nature of early stellar generations and for constraining Galactic bulge formation models, at present little is known about the metal-poor stellar content of the central Milky Way.
Beers, Timothy C., Bizyaev, Dmitry, Cunha, Katia, Ebelke, Garrett, Eisenstein, Daniel J., Frinchaboy, Peter M., Girardi, Léo, Hearty, Fred R., Holtzman, Jon, Johnson, Jennifer A., Majewski, Steven R., Malanushenko, Elena, Malanushenko, Viktor, Meszaros, Szabolcs, Nidever, David, O'Connel, Robert W., Oravetz, Daniel, Pan, Kaike, Prieto, Carlos Allende, Pérez, Ana E. García, Robin, Annie C., Schiavon, Ricardo P., Schneider, Donald P., Schultheis, Mathias, Shetrone, Matthew, Simmonsand, Audrey, Skrutskie, Michael F., Smith, Verne V., Wilson, John C., Zasowski, Gail   +29 more
core   +3 more sources

SIRIUS: Identifying Metal-poor Stars Enriched by a Single Supernova in a Dwarf Galaxy Cosmological Zoom-in Simulation Resolving Individual Massive Stars

The Astrophysical Journal Letters
Metal-poor stars enriched by a single supernova (mono-enriched stars) are direct proof (and provide valuable probes) of supernova nucleosynthesis. Photometric and spectroscopic observations have shown that metal-poor stars have a wide variety of chemical
Yutaka Hirai, Takayuki R. Saitoh, Michiko S. Fujii, Katsuhiro Kaneko, Timothy C. Beers   +4 more
doaj   +1 more source