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Signature of a massive rotating metal-poor star imprinted in the phoenix stellar stream

Casey, Andrew; Ji, Alexander P; Hansen, Terese; Li, Ting S; Koposov, Sergey; Da Costa, Gary; Bland-Hawthorn, Joss; Cullinane, Lara; Erkal, Denis; Lewis, Geraint; Kuehn, Kyler; Mackey, Dougal; Martell, Sarah


The Phoenix stellar stream has a low intrinsic dispersion in velocity and metallicity that implies the progenitor was probably a low-mass globular cluster. In this work we use Magellan/Magellan Inamori Kyocera Echelle (MIKE) high-dispersion spectroscopy of eight Phoenix stream red giants to confirm this scenario. In particular, we find negligible intrinsic scatter in metallicity (s([ ]) = - Fe II H 0.04+0.03 0.11) and a large peak-to-peak range in [Na/Fe] and [Al/Fe] abundance ratios,...[Show more]

CollectionsANU Research Publications
Date published: 2021
Type: Journal article
Source: The Astrophysical Journal
DOI: 10.3847/1538-4357/ac1346


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