342 citations · 6.5k across the 144 of their papers we have counts for
11 papers · 1 filter
Element abundance patterns in stars indicate fission of nuclei heavier than uranium
Ian U. Roederer, Nicole Vassh, Erika M. Holmbeck +9
The heaviest chemical elements are naturally produced by the rapid neutron-capture process (r-process) during neutron star mergers or supernovae. The r-process production of elemen…
Probing the early Milky Way with GHOST spectra of an extremely metal-poor star in the Galactic disk
Anya Dovgal, Kim A. Venn, Federico Sestito +31
Pristine_183.6849+04.8619 (P1836849) is an extremely metal-poor ([Fe/H]) star on a prograde orbit confined to the Galactic disk. Such stars are rare and may have their…
rrlfe: Software for Generating and Applying Metallicity Calibrations for RR Lyrae Variable Stars Across a Wide Range of Phases and Temperatures
Eckhart Spalding, Ronald Wilhelm, Nathan De Lee +7
RR Lyrae stars play a central role in tracing phase-space structures within the Milky Way because they are easy to identify, are relatively luminous, and are found in large numbers…
Characterisation of high velocity stars in the S-PLUS internal fourth data release
F. Quispe-Huaynasi, F. Roig, V. M. Placco +7
In general, the atypical high velocity of some stars in the Galaxy can only be explained by invoking acceleration mechanisms related to extreme astrophysical events in the Milky Wa…
SPLUS J142445.34-254247.1: An R-Process Enhanced, Actinide-Boost, Extremely Metal-Poor star observed with GHOST
Vinicius M. Placco, Felipe Almeida-Fernandes, Erika M. Holmbeck +33
We report on the chemo-dynamical analysis of SPLUS J142445.34-254247.1, an extremely metal-poor halo star enhanced in elements formed by the rapid neutron-capture process. This sta…
DRAGONS -- A Quick Overview
Kathleen Labrie, Chris Simpson, Ricardo Cardenes +10
DRAGONS (Data Reduction for Astronomy from Gemini Observatory North and South) is a platform for the reduction and processing of astronomical data. The Python-based, open-source pa…
Abundance Analysis of Stars at Large Radius in the Sextans Dwarf Spheroidal Galaxy
Ian U. Roederer, Andrew B. Pace, Vinicius M. Placco +5
We present stellar parameters and chemical abundances of 30 elements for five stars located at large radii (3.5-10.7 times the half-light radius) in the Sextans dwarf spheroidal ga…
The Chemodynamical Nature of the Triangulum-Andromeda Overdensity
Yuri Abuchaim, Hélio D. Perottoni, Silvia Rossi +7
We present a chemodynamical study of the Triangulum-Andromeda overdensity (TriAnd) employing a sample of 31 candidate stars observed with the GRACES high-resolution (=40,000) sp…
Chemodynamical Properties and Ages of Metal-Poor Stars in S-PLUS
Felipe Almeida-Fernandes, Vinicius Placco, Helio Rocha-Pinto +10
Metal-poor stars are key to our understanding of the early stages of chemical evolution in the Universe. New multi-filter surveys, such as the Southern Photometric Local Universe S…
US National Gemini Office in the NOIRLab era
Vinicius M. Placco, Letizia Stanghellini
This article presents an overview of the US National Gemini Office (US NGO) and its role within the International Gemini Observatory user community. Throughout the years, the US NG…
Search for Extremely Metal-Poor Stars with GEMINI-N/GRACES I. Chemical-Abundance Analysis
Miji Jeong, Young Sun Lee, Timothy C. Beers +5
We present stellar parameters and abundances of 13 elements for 18 very metal-poor (VMP; [Fe/H] -2.0) stars, selected as extremely metal-poor (EMP; [Fe/H] -3.0) candidates…