Results 11 to 20 of about 1,572,221 (316)
CHEMICAL EVOLUTION IN VeLLOs [PDF]
Journal of The Korean Astronomical Society, 2007 A new type of object called "Very Low Luminosity Objects (VeLLOs)" has been discovered by the Spitzer Space Telescope. VeLLOs might be substellar objects forming by accretion. However, some VeLLOs are associated with strong outflows, indicating the previous existence of massive accretion.
Lee, Jeong-Eun
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Chemical Evolution of M31 [PDF]
, 2014 We review chemical evolution models developed for M31 as well as the abundance determinations available for this galaxy. Then we present a recent chemical evolution model for M31 including radial gas flows and galactic fountains along the disk, as well as a model for the bulge.
E. Spitoni, Francesca Matteucci
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Chemical evolution of star clusters [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2010 I discuss the chemical evolution of star clusters, with emphasis on old Galactic globular clusters (GCs), in relation to their formation histories. GCs are clearly formed in a complex fashion, under markedly different conditions from any younger clusters presently known. Those special conditions must be linked to the early formation epoch of the Galaxy
van Loon, Jacco Th.
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THE CHEMICAL EVOLUTION OF PHOSPHORUS [PDF]
The Astrophysical Journal, 2014 Phosphorus is one of the few remaining light elements for which little is known about its nucleosynthetic origin and chemical evolution, given the lack of optical absorption lines in the spectra of long-lived FGK-type stars. We have identified a P I doublet in the near-ultraviolet (2135/2136 A) that is measurable in stars of low metallicity.
Thanawuth Thanathibodee +6 more
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Galactic Chemical Evolution [PDF]
Publications of the Astronomical Society of Australia, 2003 AbstractThe primary present-day observables upon which theories of galaxy evolution are based are a system’s morphology, dynamics, colour, and chemistry. Individually, each provides an important constraint to any given model; in concert, the four represent a fundamental (intractable) boundary condition for chemodynamical simulations.
Fenner, Yeshe +4 more
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Modelling the Chemical Evolution [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractAdvanced observational facilities allow to trace back the chemical evolution of the Universe, on the one hand, from local objects of different ages and, secondly, by direct observations of redshifted objects. The chemical enrichment serves as one of the cornerstones of cosmological evolution.
S. Recchi, Gerhard Hensler
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Mutually stabilizing interactions between proto-peptides and RNA
Nature Communications, 2020 Cooperative relationships are widespread among different classes of biopolymers and are predicted to have existed during emergence of life. This study shows that proto-peptides engage in mutually stabilizing interactions with RNA, providing support for ...
Moran Frenkel-Pinter +9 more
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Life, 2022 Researchers have suggested that the condensation of low-molecular-weight aldehydes under basic conditions (e.g., pH > 11) is the prebiotic reaction responsible for the abiotic formation of carbohydrates.
Claudio Alejandro Fuentes-Carreón +3 more
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The chemical evolution of IC 10 [PDF]
Astronomy and Astrophysics, 2010 Dwarf irregular galaxies are relatively simple unevolved objects where it is easy to test models of galactic chemical evolution. We attempt to determine the star formation and gas accretion history of IC10, a local dwarf irregular for which abundance, gas, and mass determinations are available. We apply detailed chemical evolution models to predict the
Laura Magrini +7 more
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The chemical evolution of the Milky Way [PDF]
Proceedings of Frontier Research in Astrophysics – II — PoS(FRAPWS2016), 2017 10 pages, 6 figures, in Frontier Research in Astrophysics - II 23-28 May 2016 Mondello (Palermo ...
Donatella Romano +3 more
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