CHEMICAL ABUNDANCES OF THE LEO II DWARF GALAXY [PDF]
, 2008 We use previously published moderate-resolution spectra in combination with stellar atmosphere models to derive the first measured chemical abundance ratios in the Leo II dwarf Spheroidal (dSph) galaxy. We find that for spectra with signal-to-noise ratio
M. Shetrone +3 more
semanticscholar +1 more source
Rapid Chemical Enrichment by Intermittent Star Formation in GN-z11
The Astrophysical Journal LettersWe interpret the peculiar supersolar nitrogen abundance recently reported by the James Webb Space Telescope observations for GN-z11 ( z = 10.6) using our state-of-the-art chemical evolution models.
Chiaki Kobayashi, Andrea Ferrara
doaj +1 more source
The Ital-FLAMES survey of the Sagittarius dwarf spheroidal galaxy - I. Chemical abundances of bright RGB stars [PDF]
, 2005 We present iron and α element (Mg, Ca, Ti) abundances for a sample of 15 Red Giant Branch stars belonging to the main body of the Sagittarius dwarf Spheroidal galaxy.
L. Monaco +17 more
semanticscholar +1 more source
Planetary nebulae in the inner Milky Way: new abundances [PDF]
, 2009 The study of planetary nebulae in the inner-disk and bulge gives important information on the chemical abundances of elements such as He, N, O, Ar, Ne, and on the evolution of these abundances, which is associated with the evolution of intermediate-mass ...
Cavichia, O. +2 more
core +2 more sources
Oxygen abundance distributions in six late-type galaxies based on SALT spectra of HII regions
, 2015 Spectra of 34 H II regions in the late-type galaxies NGC1087, NGC2967, NGC3023, NGC4030, NGC4123, and NGC4517A were observed with the South African Large Telescope (SALT). In all 34 H II regions, oxygen abundances were determined through the "counterpart"
Grebel, E. K. +3 more
core +1 more source
Long‐Term Elevated CO2 Improves Soil Health and Rice Yields in Paddy Fields
Advanced Science, EarlyView.Combining the two longest‐running rice free‐air CO2 enrichment experiments with a global data synthesis, this study demonstrates that long‐term elevated CO2 consistently enhances soil health. In rice paddies, this improvement sustains the CO2 fertilization effect over decades.
Fan Jiang +22 more
wiley +1 more source
The Hubble Constant Anchor Galaxy NGC 4258: Metallicity and Distance from Blue Supergiants
The Astrophysical JournalA quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar value) of [ Z ] =
Rolf-Peter Kudritzki +7 more
doaj +1 more source
Subsystems of the Galactic halo, their structures and compositions
Odessa Astronomical Publications, 2017 It is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy.
V. A. Marsakov, T. V. Borkova
doaj +1 more source
Diversity and Ecological Potentials of Marine Viruses Inhabiting Continental Shelf Seas
Advanced Science, EarlyView.To the best of the knowledge, this study provides the largest viral genome dataset from a continental shelf sea. It reveals that over half of vOTUs are novel, highlighting the remarkable viral novelty in the eastern continental shelf seas of China (ECSSC).
Xiaoyue Guo +9 more
wiley +1 more source
Images, Structural Properties, and Metal Abundances of Galaxy Clusters Observed with Chandra ACIS-I at 0.1 < z < 1.3 [PDF]
, 2007 We have assembled a sample of 115 galaxy clusters at 0.1 < z < 1.3 with archived Chandra ACIS-I observations. We present X-ray images of the clusters and make available region files containing contours of the smoothed X-ray emission.
B. Maughan +3 more
semanticscholar +1 more source