Results 61 to 70 of about 4,406,721 (399)

Constraining cosmic scatter in the Galactic halo through a differential analysis of metal-poor stars [PDF]

, 2017
© ESO 2017.Context. The chemical abundances of metal-poor halo stars are important to understanding key aspects of Galactic formation and evolution. Aims.
Amanda Karakas, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Aoki, Aoki, Arnone, Asplund, Asplund, Audouze, Baumueller, Baumueller, Bensby, Bergemann, Bergemann, Biazzo, Boesgaard, Bonifacio, Bonifacio, Busso, Busso, Carlos, Caughlan, Cayrel, Cescutti, Chiaki Kobayashi, Chiappini, Chieffi, Civitarese, Coc, Coc, Coc, Cohen, Cowan, Cyburt, Eggen, Ferraro, Ferraro, Fishlock, François, Frischknecht, Fu, Gustafsson, Hampel, Hannaford, Hansen, Hartog, Heger, Henrique Reggiani, Herwig, Hollek, Hou, Iocco, Jacobson, Ji, Jorge Meléndez, Karakas, Karakas, Keller, Kim, Kobayashi, Kobayashi, Kobayashi, Kohri, Lai, Lawler, Lind, Lind, Liu, Liu, Maeda, McCrea, McWilliam, Meléndez, Meléndez, Meléndez, Meléndez, Meyer, Meynet, Monroe, Nissen, Nissen, Nissen, Nomoto, Norris, Norris, O’Malley, Pignatari, Placco, Placco, Placco, Pllumbi, Ramírez, Ramírez, Ramírez, Ramírez, Ramírez, Ramírez, Reggiani, Richard, Roederer, Ryan, Ryan, Ryan, Salvati, Santucci, Scholz, Schuster, Searle, Shigeyama, Sills, Sitnova, Sneden, Spina, Spite, Spite, Spite, Suda, Suda, Thielemann, Tucci Maia, Tucci Maia, Umeda, Vinicius Placco, Wood, Yamada, Yi, Yong, Zhao, Önehag   +131 more
core   +2 more sources

Chemical Abundances as Population Tracers [PDF]

, 2013
Chapter to appear in textbook "Planets, Stars & Stellar Systems", Vol. 5, Ed. G. Gilmore, Springer-Verlag.
openaire   +4 more sources

Chemical Abundances of a Sample of Oxygen-dominated Galaxies

The Astrophysical Journal, 2023
We spectroscopically analyzed a sample of 85 Sloan Digital Sky Survey compact, oxygen-dominated galaxies located at redshift z ∼ 0.001–0.350, selected because of their large equivalent width of [O iii ] λ 5007 (larger than 200 Å). These galaxies might be
B. E. Miranda-Pérez, A. M. Hidalgo-Gámez   +1 more
doaj   +1 more source

The Chemical Composition of HD47536: A Planetary Host Halo Giant with Possible λ Bootis Features and Signs of Interstellar Matter Accretion [PDF]

Journal of Astronomy and Space Sciences, 2022
We investigated the chemical composition of the planetary host halo star HD47536 via high-resolution spectral observations recorded using a 1.5 meter Cerro Tololo Inter-American Observatory (CTIO) telescope (Chile).
Alexander Yushchenko, Dmytry Doikov, Sergei Andrievsky, Yeuncheol Jeong, Volodymyr Yushchenko, Pakakaew Rittipruk, Valery Kovtyukh, Aizat Demessinova, Vira Gopka, Alexander Raikov, Kyung Sook Jeong   +10 more
doaj   +1 more source

Connecting the primordial and Galactic deuterium abundances [PDF]

, 2007
The deuterium abundances inferred from observations of the interstellar medium within 1-2 kpc of the Sun range over a factor of three and the corresponding oxygen abundances show an even larger dispersion.
Romano, Donatella, Steigman, Gary, Tosi, Monica   +2 more
core   +3 more sources

DETAILED CHEMICAL ABUNDANCES IN THE r-PROCESS-RICH ULTRA-FAINT DWARF GALAXY RETICULUM 2 [PDF]

, 2016
The ultra-faint dwarf (UFD) galaxy Reticulum 2 (Ret 2) was recently discovered in images obtained by the Dark Energy Survey. We have observed the four brightest red giants in Ret 2 at high spectral resolution using the Michigan/Magellan Fiber System.
I. Roederer, M. Mateo, J. I. Iii, Ying-Yi Song, E. Bell, J. Crane, S. Loebman, D. Nidever, E. Olszewski, S. Shectman, I. Thompson, M. Valluri, M. Walker   +12 more
semanticscholar   +1 more source

Solar System chemical abundances corrected for systematics [PDF]

, 2014
The relative chemical abundances between CI meteorites and the solar photosphere exhibit a significant trend with condensation temperature. A trend with condensation temperature is also seen when the solar photospheric abundances are compared to those of nearby solar twins.
arxiv   +1 more source

Chemical Processes in Protoplanetary Disks [PDF]

, 2010
We have developed a high resolution combined physical and chemical model of a protoplanetary disk surrounding a typical T Tauri star. Our aims were to use our model to calculate the chemical structure of disks on small scales (sub-milli-arcsecond in the ...
Aikawa, Bottinelli, Carr, Catherine Walsh, Ceccarelli, Ceccarelli, D'Alessio, Dutrey, Dutrey, Gibb, Guilloteau, Hasegawa, Henning, Hideko Nomura, Johns-Krull, Kastner, Lahuis, Lynden-Bell, Léger, Najita, Nomura, Pascucci, Qi, Qi, Qi, Qi, Salyk, Semenov, Shakura, T. J. Millar, Valenti, Weingartner, Willacy, Willacy, Willacy, Willacy, Yamamoto, Öberg, Öberg   +38 more
core   +2 more sources

APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy [PDF]

, 2017
The Apache Point Observatory Galactic Evolution Experiment provides the opportunity of measuring elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V, Cr, Mn, Fe, Co, and Ni in vast numbers of stars.
S. Hasselquist, M. Shetrone, V. Smith, J. Holtzman, A. McWilliam, J. G. Fernández-Trincado, T. Beers, S. Majewski, D. Nidever, B. Tang, P. Tissera, E. F. Alvar, C. A. Prieto, C. A. Prieto, Andres Almeida, B. Anguiano, G. Battaglia, G. Battaglia, L. Carigi, G. D. Inglada, P. Frinchaboy, D. A. García-Hernández, D. A. García-Hernández, D. Geisler, D. Minniti, V. Placco, M. Schultheis, J. Sobeck, S. Villanova   +28 more
semanticscholar   +1 more source

The origin and abundances of the chemical elements [PDF]

Reviews of Modern Physics, 1975
A NATO Advanced Studies Institute on the Origins and Abundances of the Chemical Elements was held at the Institute of Astronomy, Cambridge, England from 23 July to 9 August 1974. The problems discussed there are the basis for this review. Three major areas can be identified.
openaire   +3 more sources