How Efficient is Rotational Mixing in Massive Stars ? [PDF]
, 1995 The VLT-Flames Survey for Massive Stars (Evans05,Evans06) provides recise measurements of rotational velocities and nitrogen surface abundances of massive stars in the Magellanic Clouds.
Brott, I. +3 more
core +6 more sources
Chemical Tracing and the Origin of Carbon in the Galactic Disk
Universe, 2022 A basic problem in studies of the evolution of chemical elements in galaxies is the uncertainties in the yields of elements produced by different types of stars.
Bengt Gustafsson
doaj +1 more source
The Open Cluster Chemical Abundances and Mapping Survey. II. Precision Cluster Abundances for APOGEE Using SDSS DR14 [PDF]
Astronomical Journal, 2018 The Open Cluster Chemical Abundances and Mapping (OCCAM) survey aims to produce a comprehensive, uniform, infrared-based spectroscopic data set for hundreds of open clusters, and to constrain key Galactic dynamical and chemical parameters from this ...
J. Donor +16 more
semanticscholar +1 more source
Machine learning in APOGEE: Identification of stellar populations through chemical abundances [PDF]
Astronomy & Astrophysics, 2019 Context. The vast volume of data generated by modern astronomical surveys offers test beds for the application of machine-learning. In these exploratory applications, it is important to evaluate potential existing tools and determine those that are ...
R. Garcia-Dias +3 more
semanticscholar +1 more source
Chemical Evolution of CNO Abundances [PDF]
, 2003 New low and intermediate star yields calculated by Buell (1997) are evaluated by using them in a Galactic Chemical Evolution model.
Mercedes Mollá, M. Gavilán
openaire +3 more sources
Precision Chemical Abundance Measurements [PDF]
Proceedings of the International Astronomical Union, 2012 AbstractThis talk covers preliminary work in which we apply a strictly differential line-by-line chemical abundance analysis to high quality UVES spectra of the globular cluster NGC 6752. We achieve extremely high precision in the measurement of relative abundance ratios.
Yong, David +3 more
openaire +3 more sources
Chemical Evolution of the Galactic Bulge as Derived from High-Resolution Infrared Spectroscopy of K and M Red Giants [PDF]
, 2006 We present chemical abundances in K and M red-giant members of the Galactic bulge derived from high-resolution infrared spectra obtained with the Phoenix spectrograph on Gemini-South.
Bessel M. S. +10 more
core +3 more sources
Analysis of chemical abundances in planetary nebulae with [WC] central stars [PDF]
Astronomy & Astrophysics, 2013 Accepted for publication in A&A. 15 Tables and 18 Figures.
Maria Teresa Ruiz +7 more
openaire +5 more sources
Chemical abundances in Seyfert galaxies – X. Sulphur abundance estimates
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line regions of a sample of Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation of the electron temperature. Narrow emission-line intensities from the Sloan Digital Sky Survey (SDSS) Data Release 17 (DR17) [in the wavelength range 3000
Oli L Dors +14 more
openaire +3 more sources
Chemical Abundances of New Member Stars in the Tucana II Dwarf Galaxy [PDF]
, 2018 We present chemical abundance measurements for seven stars with metallicities ranging from Fe/H] = −3.3 to [Fe/H] = −2.4 in the Tucana II ultra-faint dwarf galaxy (UFD), based on high-resolution spectra obtained with the MIKE spectrograph on the 6.5 m ...
A. Chiti +5 more
semanticscholar +1 more source