Results 31 to 40 of about 210,874 (237)

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

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
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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
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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.
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Chemical Abundances and Hierarchical Clustering [PDF]

Symposium - International Astronomical Union, 2004
In this contribution we study the chemical enrichment of the interstellar medium and stellar population of the building blocks of current typical galaxies in the field, in cosmological hydrodynamics simulations. The simulations include detailed modeling of chemical enrichment by SNIa and SNII In our simulations the missing metal problem is caused by ...
D.G. Lambas, P. B. Tissera
openaire   +2 more sources

Recent Development of the Atomic Line List

Galaxies, 2018
The Atomic Line List is an online database of wavelengths and transition probabilities of atomic lines. It is primarily set up as a tool to help identify unknown spectral features.
Peter A. M. van Hoof
doaj   +1 more source

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

Screening Earth Analog Exoplanets on the Basis of a Predicted Nitrogen over Phosphorus Ratio

The Astrophysical Journal, 2023
Since the first discovery in 1995, data for over 5300 exoplanets have been documented in the NASA archive, revealing a vast diversity. Identifying life-enabling analogs of the Earth among this rapidly expanding catalog is of major interest. The stability
Hervé Toulhoat
doaj   +1 more source

Abundances in the Galactic bulge: results from planetary nebulae and giant stars

, 2008
Our understanding of the chemical evolution of the Galactic bulge requires the determination of abundances in large samples of giant stars and planetary nebulae (PNe).
Barbuy, B., Chiappini, C., Gorny, S., Stasinska, G.   +3 more
core   +2 more sources

A Systematic NLTE Study of Very Metal-poor Stars with Metallicity down to −4.3 dex. I. Global Stellar Parameters Based on High-resolution Spectra

The Astrophysical Journal
Very metal-poor (VMP) stars provide a record of the chemical composition and dynamics of the early Galaxy. Based on the high-resolution and high signal-to-noise ratio spectra from the Subaru Telescope for 103 VMP stars, in this series of papers we ...
Jianrong Shi, Gang Zhao, Shuai Liu, Zeming Zhou, Haining Li, Hongliang Yan, Sofya Alexeeva, Huawei Zhang, Wako Aoki, Tadafumi Matsuno, Jingkun Zhao, Huiling Chen, Yufu Shen   +12 more
doaj   +1 more source