Results 31 to 40 of about 895,436 (365)
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
WHAT ARE LITTLE WORLDS MADE OF? STELLAR ABUNDANCES AND THE BUILDING BLOCKS OF PLANETS [PDF]
, 2015 If the photospheres of solar-type stars represent the composition of circumstellar disks from which any planets formed, spectroscopic determinations of stellar elemental abundances offer information on the composition of those planets, including smaller,
E. Gaidos
semanticscholar +1 more source
Stellar Iron Abundances: Non‐LTE Effects [PDF]
The Astrophysical Journal, 1999 22 pages, 9 figures, 1 table, ApJ style ...
Thevenin, F., Idiart, T. P.
openaire +2 more sources
Constraining planet structure from stellar chemistry: the cases of CoRoT-7, Kepler-10, and Kepler-93 [PDF]
, 2015 We explore the possibility that the stellar relative abundances of different species can be used to constrain the bulk abundances of known transiting rocky planets.
Adibekyan, V. +12 more
core +2 more sources
Clustering in the stellar abundance space [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 15 pages, 13 figures, accepted by MNRAS, author scientific names were ...
Boesso, R., Rocha-Pinto, H. J.
openaire +2 more sources
Stellar Nucleosynthesis in the Hyades Open Cluster [PDF]
, 2009 We report a comprehensive light element (Li, C, N, O, Na, Mg, and Al) abundance analysis of three solar-type main sequence (MS) dwarfs and three red giant branch (RGB) clump stars in the Hyades open cluster using high-resolution and high signal-to-noise ...
Allende Prieto +48 more
core +3 more sources
Stellar Oxygen Abundances [PDF]
Publications of the Astronomical Society of the Pacific, 1994 This dissertation addresses several issues concerning stellar oxygen abundances. The 7774 {A} O I triplet equivalent widths of Abia & Rebolo [1989, AJ, 347, 186] for metal-poor dwarfs are found to be systematically too high. I also argue that current effective temperatures used in halo star abundance studies may be ~150 K too low.
openaire +1 more source
Lithium in Turnoff Stars in the Globular Cluster M5: A Quest for Primordial Lithium
The Astrophysical Journal, 2023 The light element lithium is formed by nucleosynthesis during the Big Bang. Its abundance can help to define the parameters of the early Universe. To find this primordial value, it is necessary to determine Li abundances in the oldest stars because it is
Ann Merchant Boesgaard +1 more
doaj +1 more source
The Abundance of S-Process Elements: Temporal and Spatial Trends from Open Cluster Observations
Universe, 2022 Spectroscopic observations of stars belonging to open clusters, with well-determined ages and distances, are a unique tool for constraining stellar evolution, nucleosynthesis, mixing processes, and, ultimately, Galactic chemical evolution.
Laura Magrini +8 more
doaj +1 more source
Uncertainties in Stellar Abundance Analyses [PDF]
Highlights of Astronomy, 2005 AbstractOver the last half-century quantitative stellar spectroscopy has made great progress. However, most stellar abundance analyses today still employ rather simplified models, which can introduce severe systematic errors swamping the observational errors.
openaire +2 more sources