J
Jeffrey D. Simpson
Researcher at University of New South Wales
Publications - 97
Citations - 4008
Jeffrey D. Simpson is an academic researcher from University of New South Wales. The author has contributed to research in topics: Stars & Galaxy. The author has an hindex of 26, co-authored 97 publications receiving 2835 citations. Previous affiliations of Jeffrey D. Simpson include University of Canterbury & University of Sydney.
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Journal ArticleDOI
Spectral matching for abundances and clustering analysis of stars on the giant branches of ω Centauri
TL;DR: In this paper, a combination of photometry and lower resolution spectroscopy was used to determine stellar parameters and abundances for 221 giant branch stars in the globular cluster ω Centauri.
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Spectral matching for abundances of 848 stars of the giant branches of the globular cluster ω Centauri
TL;DR: In this paper, the effective temperatures, surface gravities and abundances of 848 giant branch stars, of which 557 also have well-defined nitrogen abundances, of the globular cluster {\omega} Centauri were presented.
Journal ArticleDOI
Spectral matching for abundances and clustering analysis of stars on the giant branches of {\omega} Centauri
TL;DR: In this article, a combination of photometry and lower-resolution spectroscopy was used to determine stellar parameters and abundances for 221 giant branch stars in the globular cluster {\omega} Centauri.
Journal ArticleDOI
The GALAH survey: Multiple stars and our Galaxy. I. A comprehensive method for deriving properties of FGK binary stars
Gregor Traven,Sofia Feltzing,Thibault Merle,M. Van der Swaelmen,Klemen Čotar,Ross P. Church,Tomaž Zwitter,Yuan-Sen Ting,Yuan-Sen Ting,Yuan-Sen Ting,Christian L. Sahlholdt,Martin Asplund,Joss Bland-Hawthorn,G. M. De Silva,Kenneth C. Freeman,Sarah L. Martell,Sanjib Sharma,Daniel B. Zucker,Sven Buder,Sven Buder,Andrew R. Casey,Valentina D'Orazi,Janez Kos,Geraint F. Lewis,Jing Lin,Karin Lind,Karin Lind,Jeffrey D. Simpson,Dennis Stello,Ulisse Munari,Robert A. Wittenmyer +30 more
TL;DR: In this paper, a sample of 12760 well-characterised double-lined spectroscopic binaries that are appropriate for statistical studies of the binary populations were detected as SB2s using a t-distributed stochastic neighbour embedding (t-SNE) classification and a cross-correlation analysis of GALAH spectra.
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A nitrogen-enhanced metal-poor star discovered in the globular cluster ESO280-SC06
TL;DR: In this article, the only very nitrogen-enhanced metal-poor star known in a Galactic globular cluster was discovered, which has [N/Fe]$>+2.5, while the other stars in the cluster show no obvious enhancement in nitrogen.