GHOST 调试科学结果：在网罟座 II 中证认一颗新的化学特殊星
星系天体物理
2023-06-09 v1
摘要
Gemini 高分辨率光学摄谱仪（GHOST）是为大口径望远镜研制的最新高分辨率摄谱仪，近期已在 Gemini 南望远镜上部署并完成调试。本文呈现 GHOST 摄谱仪在调试运行期间取得的首批科学结果。我们观测了明亮的贫金属基准星 HD 122563，以及超暗矮星系 Ret II 中的两颗恒星；其中一颗先前被证认为候选成员，但此前未有详细的化学丰度分析。该星（GDR3 0928）被确认为 Ret II 的真实成员，且通过谱综合分析法揭示其为一颗 CEMP-r 星，除具有如同许多其他 Ret II 恒星的 r-过程增丰外，还在多个轻元素（C、N、O、Na、Mg 与 Si）上显著增丰。该星的轻元素增丰模式类似于其他超暗矮星系中 CEMP-no 星的丰度分布，被认为由独立于 r-过程的源产生。这些异常丰度模式被认为由暗弱超新星产生，而后者可能由最早几代恒星中的一部分所产生。
引用
@article{arxiv.2306.04804,
title = {GHOST Commissioning Science Results: Identifying a new chemically peculiar star in Reticulum II},
author = {Christian R. Hayes and Kim A. Venn and Fletcher Waller and Jaclyn Jensen and Alan W. McConnachie and John Pazder and Federico Sestito and Andre Anthony and Gabriella Baker and John Bassett and Joao Bento and Gregory Burley and Jurek Brzeski and Scott Case and Edward Chapin and Timothy Chin and Eric Chisholm and Vladimir Churilov and Adam Densmore and Ruben Diaz and Jennifer Dunn and Michael Edgar and Tony Farrell and Veronica Firpo and Joeleff Fitzsimmons and Juan Font-Serra and Javier Fuentes and Colin Ganton and Manuel Gomez-Jimenez and Tim Hardy and David Henderson and Alexis Hill and Brian Hoff and Michael Ireland and Venu Kalari and Neal Kelly and Urs Klauser and Yuriy Kondrat and Kathleen Labrie and Sam Lambert and Lance Luvaul and Jon Lawrence and Jordan Lothrop and G. Scott Macdonald and Slavko Mali and Steve Margheim and Richard McDermid and Helen McGregor and Bryan Miller and Felipe Miranda and Rolf Muller and Jon Nielsen and Ryan Norbury and Oliver Oberdorf and Naveen Pai and Gabriel Perez and Pablo Prado and Ian Price and Carlos Quiroz and Vladimir Reshetov and Gordon Robertson and Roque Ruiz-Carmona and Ricardo Salinas and Kim M. Sebo and Andrew Sheinis and Matthew Shetrone and Keith Shortridge and Katherine Silversides and Karleyne Silva and Chris Simpson and Greg Smith and Kei Szeto and Julia Tims and Eduardo Toro and Cristian Urrutia and Sudharshan Venkatesan and Lewis Waller and Ivan Wevers and Ramunas Wierzbicki and Marc White and Peter Young and Ross Zhelem},
journal= {arXiv preprint arXiv:2306.04804},
year = {2023}
}
备注
23 pages, 9 figures, 7 tables, submitted to the AAS Journals