Results 1 to 10 of about 4,372,191 (364)
Chemical abundances in active galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT The Sloan Digital Sky Survey (SDSS) has proved to be a powerful resource for understanding the physical properties and chemical composition of star-forming galaxies in the local Universe. The SDSS population of active galactic nuclei (AGNs) remains as of yet less explored in this capacity.
E. C. Moran, Sophia R Flury
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Chemical Abundances in Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1978 PN can be divided into four types depending on their chemical composition. In order of decreasing heavy element abundances the types are: I) He and N rich, II) intermediate population, III) high velocity, and IV) halo population. The type II PN are overabundant in N and C relative to the Orion Nebula.
M. Peimbert
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CHEMICAL ABUNDANCES IN CLUSTERS OF GALAXIES
, 1995 25 pages of uuencoded compressed PostScript. 4 PostScript figures and 4 PostScript tables available from http://www-astro.physics.ox.ac.uk/~bkg/gibson.html Accepted for publication in Astronomy & Astrophysics.
F. Matteuccí, B. K. Gibson
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Chemical abundances in the damped Lyα systems [PDF]
SPIE Proceedings, 2000 14 pages, 7 figures; a refereed review paper to appear in Carnegie Observatories Astrophysics Series, Vol. 4: Origin and Evolution of the Elements, ed. A. McWilliam & M. Rauch (Cambridge: Cambridge Univ. Press)
J. X. Prochaska
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Origin of cosmic chemical abundances [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 Cosmological N-body hydrodynamic computations following atomic and molecular chemistry (e$^-$, H, H$^+$, H$^-$, He, He$^+$, He$^{++}$, D, D$^+$, H$_2$, H$_2^+$, HD, HeH$^+$), gas cooling, star formation and production of heavy elements (C, N, O, Ne, Mg, Si, S, Ca, Fe, etc.) from stars covering a range of mass and metallicity are used to explore the ...
Edoardo Tescari, U. Maio, U. Maio
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On the influence of the environment on galactic chemical abundances [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 We examine the influence of the environment on the chemical abundances of late-type galaxies with masses of 10^9.1 M_sun - 10^11 M_sun using data from the Sloan Digital Sky Survey(SDSS). We find that the environmental influence on galactic chemical abundances is strongest for galaxies with masses of 10^9.1 M_sun to 10^9.6 Msun.
Lars Mattsson +6 more
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Chemical abundances and kinematics of barium stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 In this paper we present an homogeneous analysis of photospheric abundances based on high-resolution spectroscopy of a sample of 182 barium stars and candidates. We determined atmospheric parameters, spectroscopic distances, stellar masses, ages, luminosities and scale height, radial velocities, abundances of the Na, Al, $alpha$-elements, iron-peak ...
Natalia A. Drake +9 more
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Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec [PDF]
Research Notes of the AAS, 2022 Using a data-driven machine learning tool we report T eff, log(g) , vsin(i) , and elemental abundances for 15 elements (C, N, O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Ni, Y) for a sample of 25 exoplanet host stars targeted by JWST's first year of ...
A. Polanski +4 more
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Detailed Chemical Abundances for a Benchmark Sample of M Dwarfs from the APOGEE Survey [PDF]
Astrophysical Journal, 2022 Individual chemical abundances for 14 elements (C, O, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, Fe, and Ni) are derived for a sample of M dwarfs using high-resolution, near-infrared H-band spectra from the Sloan Digital Sky Survey-IV/Apache Point Observatory
D. Souto +20 more
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Detailed Chemical Abundances of Stars in the Outskirts of the Tucana II Ultrafaint Dwarf Galaxy [PDF]
Astronomical Journal, 2022 We present chemical abundances and velocities of five stars between 0.3 and 1.1 kpc from the center of the Tucana II ultrafaint dwarf galaxy (UFD) from high-resolution Magellan/MIKE spectroscopy. We find that every star is deficient in metals (−3.6 < [Fe/
A. Chiti +8 more
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