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arxiv: 2306.04804 · v1 · pith:CWR7LJ3Tnew · submitted 2023-06-07 · 🌌 astro-ph.GA

GHOST Commissioning Science Results: Identifying a new chemically peculiar star in Reticulum II

Christian R. Hayes , Kim A. Venn , Fletcher Waller , Jaclyn Jensen , Alan W. McConnachie , John Pazder , Federico Sestito , Andre Anthony
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Gabriella Baker John Bassett Joao Bento Gregory Burley Jurek Brzeski Scott Case Edward Chapin Timothy Chin Eric Chisholm Vladimir Churilov Adam Densmore Ruben Diaz Jennifer Dunn Michael Edgar Tony Farrell Veronica Firpo Joeleff Fitzsimmons Juan Font-Serra Javier Fuentes Colin Ganton Manuel Gomez-Jimenez Tim Hardy David Henderson Alexis Hill Brian Hoff Michael Ireland Venu Kalari Neal Kelly Urs Klauser Yuriy Kondrat Kathleen Labrie Sam Lambert Lance Luvaul Jon Lawrence Jordan Lothrop G. Scott Macdonald Slavko Mali Steve Margheim Richard McDermid Helen McGregor Bryan Miller Felipe Miranda Rolf Muller Jon Nielsen Ryan Norbury Oliver Oberdorf Naveen Pai Gabriel Perez Pablo Prado Ian Price Carlos Quiroz Vladimir Reshetov Gordon Robertson Roque Ruiz-Carmona Ricardo Salinas Kim M. Sebo Andrew Sheinis Matthew Shetrone Keith Shortridge Katherine Silversides Karleyne Silva Chris Simpson Greg Smith Kei Szeto Julia Tims Eduardo Toro Cristian Urrutia Sudharshan Venkatesan Lewis Waller Ivan Wevers Ramunas Wierzbicki Marc White Peter Young Ross Zhelem
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keywords starstarsabundancefaintghostproducedspectrographanalysis
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The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high resolution spectrograph to be developed for a large aperture telescope, recently deployed and commissioned at the Gemini-South telescope. In this paper, we present the first science results from the GHOST spectrograph taking during its commissioning runs. We have observed the bright metal-poor benchmark star HD 122563, along with two stars in the ultra faint dwarf galaxy, Ret II, one of which was previously identified as a candidate member, but did not have a previous detailed chemical abundance analysis. This star (GDR3 0928) is found to be a bona fide member of Ret II, and from a spectral synthesis analysis, it is also revealed to be a CEMP-r star, with significant enhancements in the several light elements (C, N, O, Na, Mg, and Si), in addition to featuring an r-process enhancement like many other Ret II stars. The light-element enhancements in this star resemble the abundance patterns seen in the CEMP-no stars of other ultra faint dwarf galaxies, and are thought to have been produced by an independent source from the r-process. These unusual abundance patterns are thought to be produced by faint supernovae, which may be produced by some of the earliest generations of stars.

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  1. The \emph{R}-process Alliance: A Bright, Strongly \emph{R}-process-enhanced Extremely Metal-poor Star Observed with GHOST

    astro-ph.SR 2026-05 unverdicted novelty 5.0

    Observational analysis of EMP stars including a new r-process enhanced star G256353 whose heavy-element pattern matches scaled solar and neutron-star-merger predictions, supporting r-process universality.