Results 41 to 50 of about 876,778 (355)

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, Constantine P. Deliyannis   +1 more
doaj   +1 more source

Abundances in Stellar Populations [PDF]

Symposium - International Astronomical Union, 1976
Stellar abundances are reviewed with emphasis on large-scale effects which may yield clues to galactic structure and evolution. Spectroscopic and indirect photoelectric abundance criteria are discussed, and utilized.The abundance statistics of nearby galactic disk stars, dominated by M dwarfs, but observed at spectral types F and GV and K III, suggest ...
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, Armstrong, Arnett, Asplund, Böhm-Vitense, Carlsson, Clayton, Denissenkov, Duncan, El Eid, El Eid, Ferguson, Fitzpatrick, Gratton, Gratton, Gustafsson, Hamdani, Jacobson, Jacobson, Jeremy R. King, Kjaergaard, Kunz, Kupka, Lambert, Lih-Sin The, Luck, Mandell, Paulson, Piskunov, Rolfs, Ryabchikova, Schuler, Schuler, Schuler, Shetrone, Simon C. Schuler, Smith, Stürenburg, Takeda, Takeda, Takeda, Tautvaišiene, Taylor, The, The, Timmes, Varenne, Yi, Yong   +48 more
core   +3 more sources

STELLAR ABUNDANCES IN THE SOLAR NEIGHBORHOOD: THE HYPATIA CATALOG [PDF]

, 2014
We compile spectroscopic abundance data from 84 literature sources for 50 elements across 3058 stars in the solar neighborhood, within 150 pc of the Sun, to produce the Hypatia Catalog.
N. Hinkel, N. Hinkel, Francis Timmes, Francis Timmes, P. Young, M. Pagano, M. Turnbull   +6 more
semanticscholar   +1 more source

Stellar abundances and presolar grains trace the nucleosynthetic origin of molybdenum and ruthenium [PDF]

, 2014
This work presents a large consistent study of molybdenum (Mo) and ruthenium (Ru) abundances in the Milky Way. These two elements are important nucleosynthetic diagnostics. In our sample of 71 Galactic metal-poor field stars, we detect Ru and/or Mo in 52
C. Hansen, A. Andersen, N. Christlieb
semanticscholar   +1 more source

Stellar and Gaseous Abundances in M82

The Astrophysical Journal, 2004
The near infrared (IR) absorption spectra of starburst galaxies show several atomic and molecular lines from red supergiants which can be used to infer reliable stellar abundances. The metals locked in stars give a picture of the galaxy metallicity prior to the last burst of star formation. The enrichment of the new generation of stars born in the last
Andrea Comastri, Livia Origlia, Piero Ranalli, Roberto Maiolino   +3 more
openaire   +3 more sources

The Stellar Abundances for Galactic Archaeology (SAGA) Database – III. Analysis of enrichment histories for elements and two modes of star formation during the early evolution of the Milky Way [PDF]

, 2013
We study the enrichment histories for nine elements, C, four alpha-elements of Mg, Si, Ca, and Ti, Sc, and three iron-peak elements of Co, Ni, and Zn, by using a large number of stellar data, collected by the Stellar Abundances for Galactic Archaeology ...
S. Yamada, T. Suda, Y. Komiya, W. Aoki, M. Fujimoto   +4 more
semanticscholar   +1 more source

Stellar Parameters and Chemical Abundances Estimated from LAMOST-II DR8 MRS Based on Cycle-StarNet

The Astrophysical Journal Supplement Series, 2023
Deriving stellar atmospheric parameters and chemical abundances from stellar spectra is crucial for understanding the evolution of the Milky Way. By performing a fitting with MARCS model atmospheric theoretical synthetic spectra combined with a domain ...
Rui Wang, A-Li Luo, Shuo Zhang, Yuan-Sen Ting, Teaghan O’Briain, LAMOST MRS Collaboration   +5 more
doaj   +1 more source

TRACING THE EVOLUTION OF HIGH-REDSHIFT GALAXIES USING STELLAR ABUNDANCES [PDF]

, 2013
This paper presents the first results from a model for chemical evolution that can be applied to N-body cosmological simulations and quantitatively compared to measured stellar abundances from large astronomical surveys. This model convolves the chemical
Brian Crosby, B. O’Shea, T. Beers, J. Tumlinson   +3 more
semanticscholar   +1 more source

Stellar Abundances in Local Group Galaxies [PDF]

Highlights of Astronomy, 2005
AbstractHere we describe some of our latest results from measuring detailed abundances in Local Group dwarf galaxies with the VLT. Combining spectroscopic abundances with Color-Magnitude diagrams allows the effective measurement of detailed chemical evolution with time in these galaxies.
Eline Tolstoy, Kim Venn
openaire   +3 more sources