Results 101 to 110 of about 334 (140)

Thermodynamics of the Primordial Universe. [PDF]

Entropy (Basel)
Pereira DS, Ferraz J, Lobo FSN, Mimoso JP.   +3 more
europepmc   +1 more source

C₂₀ and nitrogen-substituted fullerenes: anharmonic IR and UV-vis spectra for astrophysical environments. [PDF]

RSC Adv
Karri VL, Chaudhari A, Onaka T, Naganathappa M.   +3 more
europepmc   +1 more source

The Complex (Organic) Puzzle of the Formation of Hydrogen Cyanide and Isocyanide on Interstellar Ice Analogues. [PDF]

J Phys Chem Lett
Enrique-Romero J, Lamberts T.
europepmc   +1 more source

Tidal tail identification and detailed analysis of the open star cluster King 13 using Gaia DR3 and 2MASS. [PDF]

Sci Rep
Ahmed NM, Darwish MS.
europepmc   +1 more source

On the use of sulphur as a tracer for abundances in galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2022
Abstract 2+We present a methodology for the use of sulphur as global metallicity tracer in galaxies, allowing performing a complete abundance analysis using only the red-to-near-infrared spectral region. We have applied it to a compilation of high-quality data split into two samples: H ii regions (DHR) in spiral and irregular galaxies ...
Angeles Isabel Díaz Beltran, Sandra Zamora   +1 more
exaly   +4 more sources

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Abundances in Galaxies

Astrophysics and Space Science, 2001
To start things going, the following topics were suggested:* 1. Reliability of abundances Stars vs H ii regions H ii classical diagnostics Effects of shocks and inhomogeneities on H ii-region diagnostics H n new diagnostics Can reliable H ii-region diagnostics be developed for high metallicity?
B. E. J. Pagel, M. G. Edmunds
openaire   +1 more source

Abundances in dwarf galaxies

AIP Conference Proceedings, 1989
In an attempt to discover regions of very low heavy element abundance, we have observed H II regions in 7 nearby, very low luminosity dwarf irregular galaxies. All yield oxygen abundances of less than one‐tenth of the solar value, and three are within a factor of two of the lowest oxygen abundance ever detected in an H II region.
Evan D. Skillman, R. C. Kennicutt
openaire   +1 more source

The evolution of abundances in the galaxy

AIP Conference Proceedings, 1989
This very brief review of the evolution of the abundances in our Galaxy first recalls the main observational facts regarding such abundances which have to be taken into account by any model of chemical evolution of our Galaxy. After having defined what are the crucial parameters which define such models, the emphasis is made on two approaches: the ...
openaire   +1 more source

Molecular Abundances in Galaxies

AIP Conference Proceedings, 2006
Two topics are discussed here. The first is an observational study on molecular abundance in nearby (< 10 Mpc) gas‐rich galaxies based on our ammonia survey and on data in literature. As a result, a systematically peculiar molecular abundance was found in a famous starburst galaxy M 82 regarding the formation mechanisms of molecules.
openaire   +1 more source

Nebulae and abundances in galaxies

Publications of the Astronomical Society of the Pacific, 1986
Some current problems related to abundances in H II regions are briefly reviewed. For H II regions with measured electron temperatures, the discrepancy in O/H between the sun and the Orion Nebula is stressed. Studies of abundance and temperature variations within H II regions in NGC 604 are summarized.
openaire   +1 more source