Results 41 to 50 of about 1,234,720 (380)
Elemental Abundances in the X-Ray Gas of Early-Type Galaxies with XMM and Chandra Observations [PDF]
, 2009 The source of hot gas in elliptical galaxies is thought to be due to stellar mass loss, with contributions from supernova events and possibly from infall from a surrounding environment.
Alex Athey +28 more
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On Generalised Abundance, II [PDF]
Peking Mathematical Journal, 2019 The goal of this paper is to make a striking connection between several central conjectures in algebraic geometry: the Nonvanishing Conjecture, the Abundance Conjecture and the Semiampleness Conjecture for nef line bundles on K -trivial varieties.
Thomas Peternell, Vladimir Lazić
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COMPLETE ELEMENT ABUNDANCES OF NINE STARS IN THE r-PROCESS GALAXY RETICULUM II [PDF]
, 2016 We present chemical abundances derived from high-resolution Magellan/Magellan Inamori Kyocera Echelle spectra of the nine brightest known red giant members of the ultra-faint dwarf galaxy Reticulum II (Ret II). These stars span the full metallicity range
A. Ji, A. Frebel, J. Simon, A. Chiti
semanticscholar +1 more source
New Astronomy, 1999 19 pages, 1 figure. To appear in New Astronomy, for the David N.
Jean Audouze +12 more
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Surface abundances of ON stars [PDF]
Astronomy & Astrophysics, 2015 Massive stars burn hydrogen through the CNO cycle during most of their evolution. When mixing is efficient, or when mass transfer in binary systems happens, chemically processed material is observed at the surface of O and B stars. ON stars show stronger lines of nitrogen than morphologically normal counterparts.
Sergio Simón-Díaz +8 more
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Advances in Oceanography and Limnology, 2010 Over the last two decades, viruses in aquatic systems have been observed to modify, influence and control aquatic systems. Since the determination decades ago that viruses were abundant in aquatic ecosystems, researchers have demonstrated that viruses ...
Stéphan Jacquet +4 more
doaj +1 more source
Chemical Composition of RR Lyn – an Eclipsing Binary System with Am and λ Boo Type Components [PDF]
Journal of Astronomy and Space Sciences, 2017 High-resolution spectroscopic observations of the eclipsing binary system RR Lyn were made using the 1.8 m telescope at the Bohuynsan Optical Astronomical Observatory in Korea.
Yeuncheol Jeong +4 more
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Abundance and abundance change in the world's parrots [PDF]
Ibis, 2015 Estimates of population density and abundance change (differences in density or encounter rates across land uses or time periods) form the cornerstone of much of our knowledge of species' responses to environmental conditions, extinction risks and potential conservation actions. Gathering baseline data on abundance of the world's c. 10 000 bird species
Kay Royle, Stuart J. Marsden
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ABUNDANCES IN THE LOCAL REGION. II. F, G, AND K DWARFS AND SUBGIANTS [PDF]
, 2016 Parameters and abundances have been derived for 1002 stars of spectral types F, G, and K, and luminosity classes IV and V. After culling the sample for rotational velocity and effective temperature, 867 stars remain for discussion.
R. E. Luck
semanticscholar +1 more source
Interpretation of Abundance Ratios [PDF]
Publications of the Astronomical Society of Australia, 2005 In this paper we discuss abundance ratios and their relation to stellar nucleosynthesis and other parameters of chemical evolution models, reviewing and clarifying the correct use of the observed abundance ratios in several astrophysical contests. In particular, we start from the well known fact that abundance ratios depend on stellar yields, initial ...
MATTEUCCI, MARIA FRANCESCA, CHIAPPINI C.
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