Results 271 to 280 of about 250,517 (293)
Some of the next articles are maybe not open access.
Element Abundances in Stellar Coronae
1996About two years ago, the intrigue of the solar “FIP Effect”—that coronal abundances of elements with a low FIP (≲ 10 eV; e.g Fe, Mg, Si, Ca) are observed to be enhanced relative to those of high FIP elements (≳ 10 eV; e.g. O, Ne, S; see e.g. the review by Meyer 1993)—prompted us to study stellar coronal abundances based on new EUV spectra obtained with
J. J. Drake, J. M. Laming, K. G. Widing
openaire +1 more source
Abundance measurements in stellar environments
AIP Conference Proceedings, 2014Most of what we know about stars, and systems of stars, is derived from the analysis of their electromagnetic radiation. This lesson is an attempt to describe to Physicists, without any Astrophysical background, the framework to understand the present status of abundance determination in stellar environments and its limit.
openaire +1 more source
Automated stellar abundance analysis
Proceedings of the International Astronomical Union, 2013AbstractThe advent of Milky Way high-resolution spectroscopic surveys has brought our attention to the importance of precise chemical abundance measurements to disentangle the stellar population puzzle of the Galaxy. Moreover, automated stellar parameters are the bedrock of Galactic spectroscopic surveys science.
openaire +1 more source
Stellar nucleosynthesis and galactic abundances
AIP Conference Proceedings, 2001Galactic abundances are neither constant in time nor do they evolve in a simple fashion, e.g., by an enrichment of heavy elements in constant relative proportions. Instead, their evolution in space and time reflects the history of star formation and the lifetimes of the diverse contributing stellar objects.
openaire +1 more source
From Stellar Spectra to Abundances
Astrophysics and Space Science, 2001The current techniques of stellar abundances determination from high resolution spectra are discussed, and the related uncertainties arising from the analysis are examined. These involve the observational uncertainties but also physical data, and atmosphere models accuracy. This critical assessment is then used to shed light on the controversial [O/Fe]
openaire +1 more source
The Gaia-ESO Survey: Homogenisation of stellar parameters and elemental abundances
Astronomy and Astrophysics, 2023Anais Gonneau, Laura Magrini
exaly