Results 31 to 40 of about 63,862 (294)
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 +5 more
doaj +1 more source
The Cocoon Nebula and its ionizing star: do stellar and nebular abundances agree?
, 2014 (Abridged) Main sequence massive stars embedded in an HII region should have the same chemical abundances as the surrounding nebular gas+dust. The Cocoon nebula, a close-by Galactic HII region ionized by a narrow line B0.5 V single star (BD+46 3474), is ...
Esteban, C. +2 more
core +1 more source
On the Galactic chemical evolution of sulphur. Sulphur abundances from the [S i] 1082 nm line in giants [PDF]
, 2013 Context. The Galactic chemical evolution of sulphur is still under debate. At low metallicities some studies find no correlation between [S/Fe] and [Fe/H], others find [S/Fe] increasing towards lower metallicities, and still others find a combination of ...
Dupree, A. K., Matrozis, E., Ryde, N.
core +1 more source
SAGA: Stellar Abundances for Galatic Archeology [PDF]
Proceedings of XII International Symposium on Nuclei in the Cosmos — PoS(NIC XII), 2013 A tutorial for the Stellar Abundances for Galactic Archaeology (SAGA) database is presented. This paper describes the outline of the database, reports the current status of the data compilation and known problems, and presents plans for future updates and extensions.
openaire +2 more sources
Validating Stellar Abundance Measurements from Multiresolution Spectroscopy
The Astrophysical Journal Supplement Series, 2023 Abstract Large-scale surveys will provide spectroscopy for ∼50 million resolved stars in the Milky Way and Local Group. However, these data will have a high degree of heterogeneity and most will be low-resolution (R < 10,000), posing challenges to measuring consistent and reliable stellar labels.
Nathan R. Sandford +2 more
openaire +3 more sources
Testing Rotational Mixing Predictions with New Boron Abundances in Main Sequence B-type Stars
, 2005 (Abridged) New boron abundances for seven main-sequence B-type stars are determined from HST STIS spectroscopy around the BIII 2066A line. Boron abundances provide a unique and critical test of stellar evolution models that include rotational mixing ...
A. M. Brooks +20 more
core +1 more source
Masses, Oxygen and Carbon abundances in CHEPS dwarf stars [PDF]
, 2018 Reproduced with permission from Astronomy & Astrophysics. © 2019 ESOContext. We report the results from the determination of stellar masses, carbon, and oxygen abundances in the atmospheres of 107 stars from the Calan-Hertfordshire Extrasolar Planet ...
Ivanyuk, O. M. +5 more
core +3 more sources
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
Origlia, L. +3 more
openaire +2 more sources
THE SENSITIVITY OF CONVECTION ZONE DEPTH TO STELLAR ABUNDANCES: AN ABSOLUTE STELLAR ABUNDANCE SCALE FROM ASTEROSEISMOLOGY [PDF]
The Astrophysical Journal, 2012 37 pages, 12 figures, 2 tables, submitted to ApJ.
van Saders, Jennifer L. +1 more
openaire +2 more sources
, 2009 [abridged] Previous analyses of lithium abundances in main sequence and red giant stars have revealed the action of mixing mechanisms other than convection in stellar interiors.
C. Charbonnel +8 more
core +2 more sources