Prospects for Measuring Abundances of >20 Elements with Low-resolution Stellar Spectra [PDF]
, 2017 Understanding the evolution of the Milky Way calls for the precise abundance determination of many elements in many stars. A common perception is that deriving more than a few elemental abundances ([Fe/H], [α/Fe], perhaps [C/H], [N/H]) requires medium-to-
Yuan-Sen 森 Ting 丁源 +3 more
semanticscholar +1 more source
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 +2 more sources
Differential stellar population models: how to reliably measure [Fe/H] and [alpha/Fe] in galaxies [PDF]
, 2009 We present differential stellar population models, which allow improved determinations of the ages, iron and alpha-element abundances of old stellar populations from spectral fitting.
A. Gallazzi +39 more
core +1 more source
The impact of n_TOF data on s-process modelling [PDF]
EPJ Web of Conferences, 2023 We show examples of the impact of the Maxwellian averaged capture cross sections determined at n_TOF over the past 20 years on AGB stellar nucleosynthesis models.
Lanzi Samuele +5 more
doaj +1 more source
Two distinct halo populations in the solar neighborhood. II. Evidence from stellar abundances of Mn, Cu, Zn, Y, and Ba [PDF]
, 2011 A previous study (Nissen & Schuster 2010) of 94 dwarf stars with -1.6 < [Fe/H] < -0.4 has revealed the existence of two distinct halo populations with a systematic difference in [alpha/Fe] at a given metallicity.
P. Nissen, W. Schuster
semanticscholar +1 more source
Nitrogen Production in Starburst Galaxies Detected by GALEX [PDF]
, 2007 We investigate the production of nitrogen in star-forming galaxies with ultraviolet (UV) radiation detected by the Galaxy Evolution Explorer Satellite (GALEX).
Barlow, Tom A. +24 more
core +4 more sources
High-precision abundances of Sc, Mn, Cu, and Ba in solar twins. Trends of element ratios with stellar age [PDF]
, 2016 A previous study of correlations between element abundance ratios, [X/Fe], and ages of solar twin stars is extended to include Sc, Mn, Cu, and Ba. HARPS spectra with S/N > 600 are used to derive very precise (+/- 0.01 dex) differential abundances, and ...
P. Nissen
semanticscholar +1 more source
Estimating stellar atmospheric parameters, absolute magnitudes and elemental abundances from the LAMOST spectra with Kernel-based principal component analysis [PDF]
, 2016 Accurate determination of stellar atmospheric parameters and elemental abundances is crucial for Galactic archeology via large-scale spectroscopic surveys.
M. Xiang +18 more
semanticscholar +1 more source
Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210
The Astrophysical Journal, 2023 Helium variations are common features of globular clusters (GCs) with multiple stellar populations. All the formation scenarios predict that secondary population stars are enhanced in helium, but the exact helium content depends on the polluters ...
Chengyuan Li +8 more
doaj +1 more source
The RAVE-on Catalog of Stellar Atmospheric Parameters and Chemical Abundances for Chemo-dynamic Studies in the Gaia Era [PDF]
, 2016 The orbits, atmospheric parameters, chemical abundances, and ages of individual stars in the Milky Way provide the most comprehensive illustration of galaxy formation available.
A. Casey +26 more
semanticscholar +1 more source