Results 71 to 80 of about 7,914 (245)
On the oxygen abundance in our Galaxy [PDF]
Astronomy & Astrophysics, 2003 7 pages, 2 figures, accepted for publication in Astronomy and ...
Pilyugin, L. S. +2 more
openaire +2 more sources
Noble gases and nitrogen in material from asteroid Bennu
Meteoritics &Planetary Science, EarlyView.Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty +7 more
wiley +1 more source
Abundance ratios in hierarchical galaxy formation [PDF]
Astrophysics and Space Science, 1999 7 pages, 3 figures, accepted by ...
openaire +5 more sources
Meteoritics &Planetary Science, EarlyView.Abstract Amorphous carbon (αC) is found in various extraterrestrial particles, including those thought to originate from the outer Solar System. αC can form through two main processes involving C‐rich materials: exposure to energetic charged particles and thermal processing.
M. Germanà +10 more
wiley +1 more source
An Equilibrium Model of the Galaxy Determined by Element Abundance Gradients
The Astrophysical JournalWe present a method to determine the gravitational potential of the Milky Way from measurements of the locations, velocities, and element abundances of stars in the Galactic disk.
Lawrence M. Widrow +4 more
doaj +1 more source
Nanoscale space weathering features in mature lunar soil revealed by TEM and APT
Meteoritics &Planetary Science, EarlyView.Abstract Space weathering significantly alters the optical, chemical, and structural properties of lunar regolith at micro‐ and nanoscales; yet detailed nanoscale variability within individual soils remains underexplored. Here we apply transmission electron microscopy (TEM) and atom probe tomography to four mineral grains (olivine, ilmenite, and two ...
Jennika Greer +6 more
wiley +1 more source
Chemical Abundances Of The Leo II Dwarf Galaxy
, 2009 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
Cook, David O. +3 more
core +1 more source
The SVP–FRO6 Module Integrates the Control of Leaf Senescence and Flowering in Arabidopsis
Plant, Cell &Environment, EarlyView.ABSTRACT Plants coordinate major developmental transitions by integrating intrinsic genetic programs with environmental signals, where nutrient availability serves as a critical external factor shaping growth and fitness. Iron (Fe), an essential micronutrient for cellular respiration and photosynthesis, is strictly regulated through sophisticated ...
Hyunsu Park +8 more
wiley +1 more source
Subaru/HDS Abundances in Three Giant Stars in the Ursa Minor Dwarf Spheroidal Galaxy
, 2004 International audienceWith the HDS (High Dispersion Spectrograph) on the Subaru Telescope, we obtained high-resolution optical region spectra of three red giant stars (COS 4, COS 82, and COS 347) in the Ursa Minor dwarf spheroidal galaxy.
Aoki, Wako +5 more
core +1 more source
Chemical Abundances of the Typhon Stellar Stream
, 2022 We present the first high-resolution chemical abundances of seven stars in the recently discovered high-energy stream Typhon. Typhon stars have apocenters >100 kpc, making this the first detailed chemical picture of the Milky Way's very distant stellar ...
Ji, Alexander P. +4 more
core +1 more source