Results 341 to 350 of about 876,778 (355)

<i>In situ</i> analysis of titanium isotope ratios in stardust using LA-CC-MC-ICPMS/MS.

J Anal At Spectrom
Shaw KMM, Pfeifer M, Coath BLL, Lewis J, Bevan D, Coath CD, Elliott T.   +6 more
europepmc   +1 more source

Primordial Rotating Disk Composed of ≥15 Star Forming Clumps at Cosmic Dawn

Fujimoto S, Ouchi M, Kohno K, Valentino F, Giménez-Arteaga C, Brammer G, Furtak L, Kohandel M, Oguri M, Pallottini A, Richard J, Zitrin A, Bauer F, Boylan-Kolchin M, Dessauges-Zavadsky M, Egami E, Finkelstein S, Ma Z, Smail I, Watson D, Hutchison T, Rigby J, Welch B, Ao Y, Bradley L, Caminha G, Caputi K, Espada D, Endsley R, Fudamoto Y, González-López J, Hatsukade B, Koekemoer A, Kokorev V, Laporte N, Lee M, Magdis G, Ono Y, Rizzo F, Shibuya T, Shimasaku K, Sun F, Toft S, Umehata H, Wang T, Yajima H.   +45 more
europepmc   +1 more source

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High-precision stellar abundances of the elements: methods and applications

The Astronomy and Astrophysics Review, 2018
Efficient spectrographs at large telescopes have made it possible to obtain high-resolution spectra of stars with high signal-to-noise ratio and advances in model atmosphere analyses have enabled estimates of high-precision differential abundances of the
P. Nissen, B. Gustafsson
semanticscholar   +1 more source

Diquark abundance in stellar matter

Physical Review D, 1992
The clustering of quarks into pairs (diquarks) has been suggested recently to play an important role in dense matter and its astrophysical realization in neutron-star cores. We address in this work the features of diquark matter by employing an accurate equation of state valid for the effective {lambda}{phi}{sup 4} diquark theory, and find milder ...
J. A. de Freitas Pacheco, J. C. N. de Araujo, Jorge Ernesto Horvath   +2 more
openaire   +3 more sources

Stellar and Solar Abundances

Space Science Reviews, 1973
Recent spectroscopic results on stellar and solar abundances are reviewed with special reference to (a) Standard abundance distribution (Sun, hot stars, diffuse nebulae); (b) Abundance peculiarities related to stellar evolution (red giants showing results of H-burning and s-process, peculiar and metallic-lined stars); and (c) Population effects that ...
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Stellar nucleosynthesis and galactic abundances [PDF]

AIP Conference Proceedings, 2001
Galactic abundances are neither constant in time nor do they evolve in a simple fashion, e.g., by an enrichment of heavy elements in constant relative proportions. Instead, their evolution in space and time reflects the history of star formation and the lifetimes of the diverse contributing stellar objects.
D. Argast, Friedrich-Karl Thielemann, F. Brachwitz, Gabriel Martínez-Pinedo   +3 more
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Stellar chemical abundances with the GHRS

Physica Scripta, 1996
The accurate quantitative analysis of high resolution ultraviolet spectra of ultra-sharp-lined early-type, chemically peculiar stars, obtained with the Goddard High Resolution spectrograph on the Hubble Space Telescope, has been made possible by the synergism between state-of-the-art astro-physics and state-of-the-art atomic spectroscopy. We illustrate
Glenn M. Wahlgren, Glenn M. Wahlgren, Sveneric Johansson, Tomas Brage, Tomas Brage, David S. Leckrone, Charles R. Proffitt   +6 more
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Element Abundances in Stellar Coronae [PDF]

, 1996
About two years ago, the intrigue of the solar “FIP Effect”—that coronal abundances of elements with a low FIP (≲ 10 eV; e.g Fe, Mg, Si, Ca) are observed to be enhanced relative to those of high FIP elements (≳ 10 eV; e.g. O, Ne, S; see e.g. the review by Meyer 1993)—prompted us to study stellar coronal abundances based on new EUV spectra obtained with
J. J. Drake, Kenneth G. Widing, J. M. Laming   +2 more
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From Stellar Spectra to Abundances

Astrophysics and Space Science, 2001
The current techniques of stellar abundances determination from high resolution spectra are discussed, and the related uncertainties arising from the analysis are examined. These involve the observational uncertainties but also physical data, and atmosphere models accuracy. This critical assessment is then used to shed light on the controversial [O/Fe]
openaire   +2 more sources