Results 91 to 100 of about 205,088 (284)
The Astrophysical JournalWe present the elemental abundances and ages of 19 massive quiescent galaxies at z ∼ 1.4 and z ∼ 2.1 from the Keck Heavy Metal Survey. The ultradeep LRIS and MOSFIRE spectra were modeled using a full-spectrum stellar population fitting code with variable
Aliza G. Beverage +13 more
doaj +1 more source
The Distribution of Alpha Elements in Andromeda Dwarf Galaxies [PDF]
, 2014 We present alpha to iron abundance ratios for 226 individual red giant branch stars in nine dwarf galaxies of the Andromeda (M 31) satellite system. The abundances are measured from the combined signal of Mg, Si, Ca, and Ti lines in Keck/DEIMOS medium-resolution spectra.
arxiv +1 more source
Segue 1: An Unevolved Fossil Galaxy from the Early Universe [PDF]
, 2013 We present Magellan/MIKE and Keck/HIRES high-resolution spectra of six red giant stars in the dwarf galaxy Segue 1. Including one additional Segue 1 star observed by Norris et al. (2010), high-resolution spectra have now been obtained for every red giant
Frebel, Anna +2 more
core +3 more sources
Comparative analysis of dietary iron deprivation and supplementation in a murine model of colitis
FASEB BioAdvances, EarlyView.Iron deficiency and anemia are frequent complications of inflammatory bowel disease (IBD) and patients are treated with oral iron supplements. To compare the outcome of iron‐deficiency or iron‐supplementation on the severity of inflammation, wild‐type mice were fed an iron‐deficient, iron‐adequate or iron‐supplemented diet.
Thanina Medjbeur +6 more
wiley +1 more source
The investigation of chemical abundance and ionized gas kinematics in IC4662 galaxy
Вісник Астрономічної школи, 2009 The investigation of HII region optical spectra of the BCD galaxy IC4662 is presented in this paper. Spectral data were obtained at ESO VLT. This spectra includes such bright emission lines as H_β 4861, OIII 4363, 4959, 5007 etc. During the research were
K. B. Agienko
doaj +1 more source
Barium abundance in the central part of the dSph Fornax galaxy [PDF]
, 2017 We revisited barium abundance in a sample of giant stars in the dwarf spheroidal Fornax galaxy. Non-local thermodynamic equilibrium (NLTE) synthesis was used to derive the barium abundance from two Ba II lines. Our new NLTE result for barium shows that in the range of metallicities from -1 to -0.5 the abundance of this element is almost the same as in ...
arxiv +1 more source
Nucleosynthesis: Stellar and Solar Abundances and Atomic Data [PDF]
, 2006 Abundance observations indicate the presence of often surprisingly large amounts of neutron capture (i.e., s- and r-process) elements in old Galactic halo and globular cluster stars.
Collier, Jason +5 more
core +4 more sources
Journal of Applied Ecology, EarlyView.A framework for the support of pollinators in urban areas is developed here, based on five pillars: nesting, flower resources, artificial support, management and society acceptance, with additional key elements from science and society. Society should incorporate strategies for pollinators as in this framework by means of co‐planning with stakeholders,
Rosa Ranalli +3 more
wiley +1 more source
Star formation and the interstellar medium in low surface brightness galaxies. I. Oxygen abundances and abundance gradients in low surface brightness disk galaxies [PDF]
arXiv, 1998 We present measurements of the oxygen abundances in 64 HII regions in 12 LSB galaxies. We find that oxygen abundances are low. No regions with solar abundance have been found, and most have oxygen abundances $\sim 0.5$ to 0.1 solar. The oxygen abundance appears to be constant as a function of radius, supporting the picture of quiescently and ...
arxiv
Chemical Abundances of the Leo II Dwarf Galaxy
, 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 dSph galaxy.
Azzopardi +44 more
core +1 more source