Results 11 to 20 of about 1,179,358 (368)
The Astrophysical Journal, 2023 We present the first isotopic abundances of both ^13 CO and C ^18 O in solar twin stars and test the results against several galactic chemical evolution (GCE) models with different nucleosynthesis prescriptions.
David R. Coria +5 more
doaj +1 more source
Extreme CO Isotopic Abundances in the ULIRG IRAS 13120-5453: An Extremely Young Starburst or Top-heavy Initial Mass Function [PDF]
, 2017 We present ALMA 12CO (J = 1-0, 3-2 and 6-5), 13CO (J = 1-0), and C18O (J = 1-0) observations of the local ultraluminous infrared galaxy (ULIRG) IRAS 13120-5453.
K. Śliwa +3 more
semanticscholar +1 more source
Frontiers in Astronomy and Space Sciences, 2021 Among presolar grains, oxide ones are made of oxygen, aluminum, and a small fraction of magnesium, produced by the 26Al decay. The largest part of presolar oxide grains belong to the so-called group 1 and 2, which have been suggested to form in Red Giant
S. Palmerini +11 more
doaj +1 more source
The Isotopic Abundances of Magnesium in Stars [PDF]
The Astrophysical Journal, 2000 18 pages, 9 figures, 1 table.
Gay, Pamela, Lambert, David L.
openaire +3 more sources
Oxygen isotopic abundances in evolved stars. IV - Five K giants
, 1988 Michael J. Harris +2 more
openalex +2 more sources
Cold Deuterium Fractionation in the Nearest Planet-forming Disk
The Astrophysical Journal, 2023 Deuterium fractionation provides a window into the thermal history of volatiles in the solar system and protoplanetary disks. While evidence of active molecular deuteration has been observed toward a handful of disks, it remains unclear whether this ...
Carlos E. Romero-Mirza +9 more
doaj +1 more source
Sm and Gd Isotopic Shifts in Eucrites and Implications for Their Cosmic-Ray Exposure History
The Astrophysical Journal, 2023 The isotopic compositions of Sm and Gd in eight eucrites—five from a desert, Dar al Gani (DaG) 380, DaG 391, DaG 411, DaG 443, and DaG 480, and three from nondesert areas, Juvinas, Millibillillie, and Stannern—were determined to understand the cosmic-ray
Takaharu Saito +2 more
doaj +1 more source
Isotopic Titanium Abundances in Local M Dwarfs [PDF]
, 2009 Relative abundances of the five stable isotopes of titanium (^46Ti to ^50Ti) are measured for 11 M dwarfs belonging to the thin disk (four stars), thick disk (three stars), the halo (one star), and either the thick or the thin disk (three stars).
Asplund +30 more
core +2 more sources
Isotopic Composition of Solar Wind Calcium: First in Situ Measurement by CELIAS/MTOF on Board SOHO [PDF]
, 1997 We present first results on the Ca isotopic abundances derived from the high resolution Mass Time-of-Flight (MTOF) spectrometer of the charge, element, and isotope analysis system (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO).
A. B. Galvin +16 more
core +3 more sources
The abundance and isotopic composition of water in eucrites [PDF]
Meteoritics & Planetary Science, 2016 AbstractVolatile elements play a key role in the dynamics of planetary evolution. Extensive work has been carried out to determine the abundance, distribution, and source(s) of volatiles in planetary bodies such as the Earth, Moon, and Mars. A recent study showed that the water in apatite from eucrites has similar hydrogen isotopic compositions ...
T. J. Barrett +10 more
openaire +2 more sources